Question

Q1 what do you mean by pressure? how can we increase the pressure by exerting same amount of force
Q2 do liquid exert equal pressure in all direction ?
Q3 why lungs expand during inhalation

Answer 1

Pressure

Pressure is the amount of force acting on a surface ( area )

Pressure = Force / Area

Yes, we can increase the pressure by exerting same amount of force but by reducing the area ( surface )

Pressure in Liquid ( Fluid )

Yes it liquid applies equal pressure in all direction because the particles that make up the fluid can move in any direction.

Expansion of Lung during Inhalation

Lung expands during Inhalation because the pressure inside the lung reduces and more amount of air moves in the lung and hence it expands.

Answer 2

Answer:

Pressure is the force acting on unit area (Pressure=Force/Area)

Yes,we can increase the pressure by decreasing the area on which the force is acting.

It's S.I unit is Pascal

Explanation:

Because the pressure is inversely proportional to area