Question

Air pressure is measured in which of the following units?
A) Steridian
B) kg/mts
C) Newton
D) Pascal

Answer 1

answer : option (D) Pascal

explanation : air pressure is measured by Pascal. Pascal is SI unit of pressure.as you know, pressure is the ratio of applied force and cross sectional area.

so, pressure = applied force/cross sectional area

si unit of force = Newton

si unit of area = m²

so, si unit of pressure =Newton/m² or N/m². to honour of great scientist ‘Pascal’ SI unit of pressure is known as Pascal. e.g., 1Pascal = 1N/m²

hence, option (B) is correct.

Answer 2

QUESTION

Air pressure is measured in which of the following units?

A) Steridian

B) kg/mts

C) Newton

D) Pascal

ANSWER

D) Pascal(Pa)

1)It is named in honour of French mathematician Blaise Pascal.

2)It is the S.I Unit of pressure.

Derivation

As we know,

Pressure=Force/area

And S.I Unit of Force is Newton (N) and area of metre(m^2).

Let the force and length of 1(unit) then we get pressures as=>>

Pressure = 1N/1m^2

=>Pressure =1Nm^-2

Or

Pressure = 1 Pa (pascal)

Thanks