Q. 63 A3.6( 26 Votes )

# Define pressure. What is the relation between pressure, force and area? State the units in which pressure is measured.

Answer :

Pressure is defined as a measure of the force applied over a unit area. Pressure often is expressed in units of Pascals (Pa), newtons per square meter (N/m2 or kg/m.s2), or pounds per square inch. Other units include the atmosphere (atm), torr, bar, and meters sea water (msw).

In equations, pressure is denoted by the capital letter P or the lowercase letter p.

Pressure is a derived unit, generally expressed according to the units of the equation:

P = F / A

where P is pressure, F is force, and A is area

P is pressure

F is the component of force perpendicular to the surface

A is the area of the surface

When a force is constant over an area, the pressure acting on that area is simply

Pressure is a scalar quantity, thus it acts in all directions at any given point. In order for pressure to create a force, the pressure must be integrated over some area.

Rate this question :

The same force Facts on four different objects having the areas given below, one by one. In which case the pressure exerted will be the maximum?

Lakhmir Singh & Manjit Kaur - ScienceWhich of the following does not work on the existence of atmospheric pressure ?

Lakhmir Singh & Manjit Kaur - ScienceWhich of the following represent correct values for the normal atmospheric pressure?

A) 101.3 kilopascals

B) 76 mm of mercury

C) 101.3 pascals

D) 76 cm of mercury

Lakhmir Singh & Manjit Kaur - ScienceWhen a force of 5 N acts on a surface, it produces a pressure of 500 Pa. The area of surface then must be

Lakhmir Singh & Manjit Kaur - ScienceCalculate the pressure when a force of 200 N is exerted on an area of:

(a) 10m^{2} (b) 5m^{2}

Explain why, wooden (or concrete) sleepers are kept below the railway line.

Lakhmir Singh & Manjit Kaur - ScienceWhat is common in the working of the devices such as a drinking straw, a syringe, a dropper and a rubber sucker?

Lakhmir Singh & Manjit Kaur - ScienceTwo tiny holes are made in a plastic bucket, one near the middle part and the other just above bottom when this bucket is filled with water, the water rushes out from the bottom hole much faster than from the upper hole. What conclusion do you get from this observation?

Lakhmir Singh & Manjit Kaur - ScienceExplain why, when a person stands on a cushion, the depression is much more than when he lies down on it.

Lakhmir Singh & Manjit Kaur - ScienceWhy does a sharp knife cut objects more effectively than a blunt knife?

Lakhmir Singh & Manjit Kaur - Science