# Fill in the blank

(a) The unit of pressure is N\m2(Newton Per meter square).

Since Standard (S.I) unit of force is Newton(N) and of area is meter square(m2) .And As we know that

Hence Standard (S.I) unit of pressure is N/m2 (Newton per meter square).

(b) Ink rises into the ink dropper because of the atmospheric pressure acting on the surface of the ink in the bottle.

On pressing the bulb of the dropper the air inside the dropper is pushed out of the hole in the dropper. This makes the pressure of the air in the bulb less than the atmospheric pressure. Hence to make the pressure inside the bulb equal to the atmospheric pressure outside, the ink rises in the dropper.

(c) When the piston of a pump is pulled up, the pressure inside Decreases.

When the piston of the pump is pulled up all the air inside the pump is pushed outside through the narrow tube, this reduces the pressure inside the piston. Due to this reduced pressure only the water comes inside the pump so that pressure inside the pump becomes equal to the atmospheric pressure outside.

(d) The air pressure inside our body is equal to the Atmospheric pressure.

The atmosphere exerts a pressure called as the atmospheric pressure. We do not get crushed by the pressure because the atmospheric pressure inside our body is equal to the atmospheric pressure outside.

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