Question

(a)what is air pressure (b)why does a closed tin can containing boiling water get crushed when kept under a cold water tap?give short answer​

Answer 1

Answer:

a. Air pressure is the weight of air molecules pressing down on the Earth.

b. When the hot can is plunged into cold water, the vapor condenses quickly, leaving a vacuum in most of the can. The resulting large discrepancy between the outside and inside air pressure leads to a large net inward force on the can, ending with its rapid crushing.

Explanation:

Answer 2

Explanation:

(a)The standard atmosphere is a unit of pressure defined as 101325 Pa. It is sometimes used as a reference pressure or standard pressure. It is approximately equal to Earth's average atmospheric pressure at sea level.

(b)When tin filled with hot water some part of tin filled with water but remaining part fill with water vapour. when we pour cold water over the tin the water vapour condense and change into liquid water and a vacuum is created inside the tin the atmospheric pressure apply force on tin due to which tin collapsed.