Careers360 Logo
Search Colleges, Exams, Schools & more
ask-icon
share
    JEE Main, NEET: How To Study Pascal’s Law

    JEE Main, NEET: How To Study Pascal’s Law

    #NEET
    Updated on 05 Nov 2024, 03:07 PM IST

    What is Pascal's Law?The French mathematician, scientist, inventor, and theologian Blaise Pascal in 1653 published his work on fluids ‘The physical treatises of Pascal: the equilibrium of liquids’, in which he discussed principles of static fluids. A fluid at rest is a static fluid and such a state of the fluid is said to be static equilibrium. If the fluid under consideration is water then we say it is in hydrostatic equilibrium. In static equilibrium, the net force on any part of the fluid must be zero at all times otherwise the fluid will start to flow. Fluid taken here for the study is incompressible i.e., its density will remain constant.

    JEE Main, NEET: How To Study Pascal’s Law
    Pascal's law: Pressure of liquids(Image: Shutterstock)

    Statement: Let us see how the National Council for Educational Research and Training (NCERT) treats Pascal’s law, also known as Pascal's principle. This principle states that when a change in pressure is applied to an enclosed fluid, it is transmitted equally and undiminished to all portions of the fluid and to the walls of its container.

    In the above illustration, you can see that pressure is applied on the sponge ball by pressing it with the thumb and according to Pascal’s law we know that the pressure applied is transmitted equally in all directions. Hence, fluid is released with the same pressure through the pores of the sponge ball.

    Virohan Allied & Healthcare Programs

    Allied & Healthcare programs | 20+ Partner Universities & Institutes | 98% placement record

    Apply

    Before discussing the application of Pascal’s law, let us look at the mathematical expression of Pascal’s law. Suppose you apply force F1 on one of the movable pistons (left side) thereby exerting pressure p1 on the cylindrical container of cross-sectional area A1. Because of the change in pressure due to force F1, it transmits equally and undiminished to all portions of fluids.

    NEET 2026 Free Mock Test with Solutions
    Download the NEET 2026 Free Mock Test PDF with detailed solutions. Practice real exam-style questions, analyze your performance, and enhance your preparation.
    Download EBook

    From Pascal’s law,

    {"aid":null,"font":{"color":"#000000","size":12,"family":"Arial"},"backgroundColorModified":null,"code":"$$P_{1}=P_{2}$$","id":"2","type":"$$","backgroundColor":"#ffffff","ts":1644590715752,"cs":"eQhl4KJJOmIY591boIGkMw==","size":{"width":61,"height":14}}

    Pressure applied on one of the left cylinders is equal to the pressure exerted on the right cylinder

    \therefore \frac{F_{1}}{A_{1}}=\frac{F_{2}}{A_{2}}

    Pascal's Law formula

    Pascal's Law formula(Image: Shutterstock)


    The hydraulic system is based on Pascal's principle of transmission of fluid pressure equally and undiminished in all directions. Let us discuss the application of Pascal’s law

    Hydraulic Lift

    1645621237993Hydraulic Lift(Image: Shutterstock)

    In a hydraulic lift, fitted with airtight cylinders, there are two cylinders; a narrow cylinder A is connected with a wider cylinder B by an ideal fluid (incompressible). The lowering of the piston fitted to cylinder A because of application of pressure is transmitted equal and undiminished to the piston fitted to cylinder B by virtue of Pascal’s law. As a result the platform cum piston connected with the wider cylinder is lifted up.

    Advantages of Hydraulic Lifts:

    • It is cheaper to install than other elevator types.

    • It is more portable than other elevating means.

    Disadvantages of Hydraulic Lifts:

    • It has a relatively slow lifting speed.

    • Fluid (oil in the given case) in the piston system can overheat quickly due to compression, so an efficient cooling mechanism is needed.

    • Slight jerk may be felt compared to the other lift systems.

    The lifting mechanism of a hydraulic lift that we have shown here is utilizing mechanical power (because of the pressing of the piston by a person as shown in the figure) but for practical purposes we use an electrically powered pump in which fluid is pushed into a jack lifting system to lift the platform up.

    Electrically powered hydraulic lifting systemElectrically powered hydraulic lifting system

    Pistons within a cylinder at the base of the lift provide the power to the elevator to move the object placed over it up and down.

    Hydraulic Brakes

    Application of Pascal's law: Hydraulic brake systemApplication of Pascal's law: Hydraulic brake system

    The braking systems of cars, trucks, etc. are based on Pascal's law. The hydraulic brakes allow equal pressure to be transmitted throughout the liquid. It consists of a master cylinder, four-wheel cylinders (slave cylinder), and pipeline carrying braking fluid from the master cylinder to a slave cylinder.

    Brakes Applied: When the brake pedal is pressed, the force exerted applies pressure on the piston connected with the master cylinder and the pressure applied is transmitted equally and undiminished with the help of braking fluid via metal pipeline. The increase in pressure applied after pressing the pedal transmits to all the pistons of the other cylinders which leads to outward stretching of spring connected with the shoe which in turn presses drum brake. The force of friction between the brake shoe and the drum brake stops the wheels. The spring is extended because of the pressing of the brake shoe with the drum brake and both the arms of the brake shoe are in sync because of the same pressure transmitted by the liquid as per Pascal’s law.

    Brakes Released: As soon as the foot is taken off the brake pedal the spring gets relaxed because of the restoring spring force and the liquid is pushed back due to the returning of the piston towards its initial position.

    Advantages of Hydraulic Braking System :

    • Equal braking action on all wheels (equal pressure transmission because of Pascal’s law).

    • It is easy to build.

    • The low wear rate of brake linings(a layer of hard material attached to a brake shoe or brake pad to increase friction against the drum or disc).

    Disadvantages of Hydraulic Braking System :

    • The braking system may fail due to leakage of fluid from brake linings.

    • The presence of air inside the pipeline affects the whole system

    • Comparatively, it requires frequent maintenance more than the other braking systems.

    There are many devices around us that work on the principle of Pascal’s law. It may appear like a simple law but its greatness lies in its application.

    Articles
    Related Stories
    |
    Upcoming Medicine Exams
    Guru Gobind Singh Indraprastha University Paramedical Exam
    Ongoing Dates
    IPU Paramedical Exam Application Date

    2 Feb'26 - 31 Mar'26 (Online)

    Srimanta Sankaradeva University of Health Sciences BSc Nursing
    Ongoing Dates
    SSUHS BSc Nursing Application Date

    20 Mar'26 - 30 Apr'26 (Online)

    Certifications By Top Providers
    Biomolecules Structure Function in Health and Disease
    Via All India Institute of Medical Sciences New Delhi
    Economic Evaluation for Health Technology Assessment
    Via Postgraduate Institute of Medical Education and Research Chandigarh
    Industrial Biotechnology
    Via Indian Institute of Technology Kharagpur
    Maternal Infant Young Child Nutrition
    Via Indian Institute of Technology Bombay
    Counseling Psychology
    Via Savitribai Phule Pune University, Pune
    Coursera
     355 courses
    Futurelearn
     310 courses
    Edx
     233 courses
    Udemy
     191 courses
    Swayam
     106 courses
    Explore Top Universities Across Globe
    University College London, London
    Gower Street, London, WC1E 6BT
    University of Essex, Colchester
    Wivenhoe Park Colchester CO4 3SQ
    University of Nottingham, Nottingham
    University Park, Nottingham NG7 2RD
    University of Wisconsin, Madison
    329 Union South 1308 W. Dayton Street Madison, WI 53715-1149
    University of Alberta, Edmonton
    116 St. and 85 Ave., Edmonton, Alberta, Canada T6G 2R3
    Keele University, Newcastle
    Staffordshire, UK, ST5 5BG

    Popular Courses and Specializations

    Popular Degrees

    Popular Branches

    List of colleges accepting NEET

    Questions related to NEET

    On Question asked by student community

    Have a question related to NEET ?
    Previous year question paper neet

    Hi! To score good marks in NEET, it is best to practice with NEET previous years’ question papers. This helps in improving time management and also allows you to understand question trends. You can download NEET previous years’ question papers from the link provided below.
    Link NEET previous years’ question

    Read Complete Answer
    M
    Manisha Tiwari
    25 Mar'26
    I am going to give my neet exam in 2026. App is asking for the admission year in which 2026 is not in options

    Hi! Could you please elaborate on what you are referring to? It will be easier for us to help.



    Read Complete Answer
    M
    Manisha Tiwari
    25 Mar'26
    How will I score 600 plus in neet 2026 how should I study

    Hi! With strategic planning, you can definitely score 600+ marks in NEET 2026. You need to practice NEET mock test , NEET previous year's questions as these will help in understanding the question trend and learning time management. Here are some tips to help you score 600+ marks in NEET

    Read Complete Answer
    M
    Manisha Tiwari
    26 Mar'26
    Or aiims me admission ke liye neet me sc catagory ke liye kitne marks me selection hoga

    To get admission at AIIMS, candidates need to score over 620 marks for the SC category. The detailed information can be checked here.
    NEET Cut off for AIIMS

    Read Complete Answer
    S
    Shamshad Ali Dar
    25 Mar'26
    BcC-D MEMBERS HOW MUCH SCOR ON NEET

    For BC-D (backward class), a score of over 500 marks in NEET is considered a good score. While scoring around over 400 marks in NEET, candidates can get admission in private medical colleges.

    Read Complete Answer
    S
    Shamshad Ali Dar
    25 Mar'26
    View all

    Popular NEET Questions

    Column I ( Salivary gland)

     

    Column II ( Their location)

    Parotids

    I

    Below tongue

    Sub-maxillary / sub-mandibular

    Ii

    Lower jaw

    Sub-linguals

    Iii

    Cheek
    Option: 1

    a(i), b(ii) , c(iii)

     


    Option: 2

    a(ii), b(i), c(iii)

     


    Option: 3

    a(i), b(iii), c(ii)


    Option: 4

    a(iii), b(ii), c(i)


    Read Complete Answer

    Ethyl \; ester \xrightarrow[(excess)]{CH_{3}MgBr} P

    the product 'P' will be ,

    Option: 1


    Option: 2


    Option: 3

    \left ( C_{2}H_{5} \right )_{3} - C- OH


    Option: 4


    Read Complete Answer

     

        

               

     Valve name                            

    		              

    Function
        I   Aortic valve     A

    Prevents blood from going backward from the pulmonary artery to the right ventricle.
        II   Mitral valve     B

     Prevent blood from flowing backward from the right ventricle to the right atrium.
        III   Pulmonic valve     C

     Prevents backward flow from the aorta into the left

    Read Complete Answer

    Column A Column B
    A

    a) Organisation of cellular contents and further cell growth.  
    B

    b) Leads to formation of two daughter cells.
    C

    c) Cell grows physically and increase volume proteins,organells.
    D

    d)  synthesis and replication of DNA.

    Match the correct option as per the process shown in the

    Read Complete Answer

    0.014 Kg of N2 gas at 27 0C is kept in a closed vessel. How much heat is required to double the rms speed of the N2 molecules?

    Option: 1

    3000 cal


    Option: 2

    2250 cal


    Option: 3

    2500 cal


    Option: 4

    3500 cal


    Read Complete Answer

    0.16 g of dibasic acid required 25 ml of decinormal NaOH solution for complete neutralisation. The modecular weight of the acid will be

    Option: 1

    32


    Option: 2

    64


    Option: 3

    128


    Option: 4

    256


    Read Complete Answer

    0.5 F of electricity is passed through 500 mL of copper sulphate solution. The amount of copper (in g) which can be deposited will be:

    Option: 1

    31.75


    Option: 2

    15.8


    Option: 3

    47.4


    Option: 4

    63.5


    Read Complete Answer

    0.5 g of an organic substance was kjeldahlised and the ammonia released was neutralised by 100 ml 0.1 M HCl. Percentage of nitrogen in the compound is

    Option: 1

    14


    Option: 2

    42


    Option: 3

    28


    Option: 4

    72


    Read Complete Answer

    0xone is

    Option: 1

    \mathrm{KO}_{2}


    Option: 2

    \mathrm{Na}_{2} \mathrm{O}_{2}


    Option: 3

    \mathrm{Li}_{2} \mathrm{O}


    Option: 4

    \mathrm{CaO}


    Read Complete Answer

    (1) A substance  known as "Smack"

    (2) Diacetylmorphine

    (3) Possessing a white color

    (4) Devoid of any odor

    (5) Crystal compound with a bitter taste

    (6) Obtained by extracting from the latex of the poppy plant

    The above statements/information are correct for:

    Option: 1

    Morphine


    Option: 2

    Heroin


    Option: 3

    Read Complete Answer

    Begin a career in Medical and Allied Sciences. Admissions Open for

    Amity University-Noida Health and Allied Sciences Admissions
    Apply

    Amongst top 3% universities globally (QS Rankings) | Wide Range of scholarships available

    MAHE Manipal BSc Nursing 2026
    Apply

    NAAC A++ Accredited | Accorded institution of Eminence by Govt. of India | NIRF Rank #3

    SCSVMV Deemed to be University | AHA Admissions 2026
    Apply

    Alied Health Sciences at SCSVMV | NAAC 'A' Grade | AICTE & UGC Aproved | 100% Placement Support | Merit-based Scholarships

    Virohan Allied & Healthcare Programs
    Apply

    Allied & Healthcare programs | 20+ Partner Universities & Institutes | 98% placement record

    SRM Kattankulathur Dental College Admissions 2026
    Apply

    Ranked #19 by NIRF, NAAC A++ Accredited | Recognized by dental council of India

    SRM Medical College Admissions 2026
    Apply

    Ranked #18 by NIRF, NAAC A++ Accredited | Unmatched clinical exposure with over 7 lakh patients yearly

    View all Application Forms

    NEET Notifications

    Latest updates

    Explore Career Options

    By Industry
    Orthotist and Prosthetist

    Orthotists and Prosthetists are professionals who provide aid to patients with disabilities. They fix them to artificial limbs (prosthetics) and help them to regain stability. There are times when people lose their limbs in an accident. In some other occasions, they are born without a limb or orthopaedic impairment. Orthotists and prosthetists play a crucial role in their lives with fixing them to assistive devices and provide mobility.

    6 Jobs Available
    Pathologist

    A pathologist is required to examine body fluids, tissues, and organs with the help of laboratory tests and microscopic examinations. Pathologists often work in hospitals and diagnostic labs, often assisting doctors when it comes to treatment decisions. Due to the increased demand for diagnostic services, pathology offers good career opportunities in clinical practices, research and academics. 

    5 Jobs Available
    Veterinary Doctor

    A Veterinarian is responsible for diagnosing, treating, and preventing diseases in animals. The individual performs surgeries, guides nutrition, and provides animal care. A Bachelor’s in Veterinary Science (B.Vsc.) is a mandatory degree. The profession brings together medical knowledge and a strong commitment to animal welfare. 

    5 Jobs Available
    Speech Therapist

    A Speech Therapist (Speech-Language Pathologist) diagnoses and treats speech, language, communication, and swallowing disorders across all ages. They work in hospitals, schools, clinics, and more. Becoming an SLP requires a master’s degree, clinical training, and certification. With rising demand, the career offers rewarding opportunities in therapy, education, and research.

    4 Jobs Available
    Gynaecologist

    A gynaecologist is a medical specialist in women’s reproductive health, handling issues like menstruation, fertility, pregnancy, and childbirth. They perform exams, surgeries, and offer family planning services. To become one, students must complete MBBS and postgraduate training. Gynaecologists work in hospitals or clinics and are in high demand, with salaries growing significantly with experience. 

    4 Jobs Available
    Audiologist

    The audiologist career involves audiology professionals who are responsible to treat hearing loss and proactively preventing the relevant damage. Individuals who opt for a career as an audiologist use various testing strategies with the aim to determine if someone has a normal sensitivity to sounds or not. After the identification of hearing loss, a hearing doctor is required to determine which sections of the hearing are affected, to what extent they are affected, and where the wound causing the hearing loss is found. As soon as the hearing loss is identified, the patients are provided with recommendations for interventions and rehabilitation such as hearing aids, cochlear implants, and appropriate medical referrals. While audiology is a branch of science that studies and researches hearing, balance, and related disorders.

    3 Jobs Available
    Oncologist

    An oncologist is a medical doctor who diagnoses and treats cancer using chemotherapy, radiation, surgery, and other therapies. They work with a team to create treatment plans tailored to each patient. Specialisations include medical, surgical, radiation, pediatric, gynecologic, and hematologic oncology. Becoming an oncologist in India requires an MBBS and postgraduate studies in oncology.

    3 Jobs Available
    Biochemist

    A biochemist studies the chemical processes within living organisms, combining chemistry and biology. They conduct experiments, analyse data, and develop products like drugs and vaccines. Biochemists work in labs, healthcare, research, and education. A degree in biochemistry or related fields is essential, with advanced roles often requiring higher degrees. They also ensure quality control and may teach or mentor others.

    2 Jobs Available

    Never miss NEET update

    Get timely NEET updates directly to your inbox. Stay informed!