Unit of Pressure – Measurement, Types & Examples

Unit of Pressure: Unit of pressure is an important chapter in Class 10th Physics. This article will discuss all the details like types, measurements and examples of units of pressure. Due to the pandemic situation, NCERT will conduct 10th board examinations in two terms. NCERT has scheduled the CBSE 10th Term 2 exam from April 26 to May 24, 2022. The syllabus for both the terms is different. Students can find the direct link to download the syllabus for both terms in PDF format.

Embibe offers a range of study materials that includes solution sets, previous year question papers and MCQ mock tests. Students can go through these study materials to enhance their preparation. The solution sets that you will find here are prepared by experts who have adequate knowledge of the exam pattern and the marking scheme of the CBSE board. It is further important to highlight that students can access all these study materials for.

SI Unit of Pressure

The SI unit of pressure in International System of Units (SI) is Pascal.

By the definition of pressure i.e., the force acting on a unit area of a surface.

Pressure = Force / Area On Which It Acts

P = \(\frac{F}{A}\)

Here force has unit Newton (N) and the area has unit meter square.

Therefore Pressure = N/m².

We can also find the unit of pressure in terms of the standard measures that are used in our country i.e Kg, m, s.

What is 1 Pascal?

As already mentioned above, pascal is the unit of measurement of pressure in SI system. When 1 Newton force is applied on an area of 1 m², we say that the pressure is 1 pascal.

Unit of Pressure in CGS System

The CGS system unit of pressure is barye (Ba) which is equivalent to 1 dyne per cm square. Here dyne refers to the force required to accelerate the mass of 1gm to the rate of 1 cm per second.

Other Units of Pressure

Pascal and barye are the most widely used units to express pressure. However, there are other units as well:

Unit	Symbol	Bar Equivalent
Pascal	Pa	1 bar = 100,000 Pa
Bar	Bar	1 bar = 1 bar
Kilopascal	kPa	1 bar = 100 kPa
Megapascal	MPa	1 bar = 0.1 MPa
Pound per square inch	psi	1 bar = 14.5 psi
Kilogram per square centimetres	kg/cm²	1 bar = 1.02 kg/cm²
Inch of mercury column	inHg	1 bar = 29.53 inHg

Students can access the following study materials on Embibe for their exam preparation:

NCERT Solutions	NCERT Books
Class 8 Mock Test Series	Class 8 Practice Questions
Class 9 Mock Test Series	Class 9 Practice Questions
Class 10 Mock Test Series	Class 10 Practice Questions
JEE Main Mock Tests (Class 11-12 PCM)	JEE Main Practice Questions (Class 11-12 PCM)
NEET Mock Tests (Class 11-12 PCB)	NEET Practice Questions (Class 11-12 PCB)

FAQs on SI Units of Pressure

Now let us have a look at some questions that are asked on the topic.

Q1. What are the 5 units of pressure?
Ans: The 5 units of pressure are:
i) Pascal (Pa)
ii) kilopascal (kPa)
iii) Megapascal (MPa)
iv) Psi (pound per square inch)
v) Torr (mmHg)
vi) Atm (atmospheric pressure)
vii) Bar

Q2. Is atm, the SI unit of pressure?
Ans: No, it is a derived unit and 1 atm = 101325 Pa = 760 torr.

Q3. What is a unit of pressure called?
Ans: The Si or the most commonly used and preferred unit of pressure is Pascal (Pa).

Q4. Is Torr a Unit of Pressure?
Ans: The torr (symbol: Torr) is an absolute pressure unit defined as precisely 1760 of a standard atmosphere (101325 Pa).

Q5. Is Newton a unit of pressure?
Ans: Newton is not a unit pressure. It is a measure of force.

That was all the details on the unit of pressure. If you have further questions feel to use the comments section and we will get back to you at the earliest. Follow Embibe for more such articles on all topics covered under CBSE Class 10