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?
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Answer 1

Answer:

(a)Atmospheric pressure, also known as barometric pressure, is the pressure within the atmosphere of Earth. The standard atmosphere is a unit of pressure defined as 101,325 Pa, which is equivalent to 760 mm Hg, 29.9212 inches Hg, or 14.696 psi.

(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:

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