Give reasons for the following:
a) A gas completely fills the vessel in which it is kept.
b) A gas exerts pressure on the walls of the container.
Answers
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A = The force of attraction between particles of gas is negligible. Because of this, particles of gas move in all directions. Thus, a gas fills the vessel completely in which it is kept
B = Because of negligible force of attraction between particles of gas, the particles of gas have the highest kinetic energy. These properties enable the particles of gas to move in all directions and hit the walls of container from all sides. Because of this a gas exerts pressure on the walls of the container in which it is kept.
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the particles of gas have weakest forces of attraction between them.Thus they roam freely everywhere and fill its container.
gas have particles which possess high kinetic energy. While moving freely the container acts as an obstacle amd thus gas with its kinetic enery exerts pressure on the walls of its container