A gas under constant pressure will expand when heated.
The temperature is the degree of hotness or coldness of the object.
According to the ideal gas law.
pV= nRT
where, p = pressure. V = volume, n =moles of elements, R =universal gas constant and T =temperature.
When pressure is kept constant, volume is directly proportional to the temperature.
When temperature is increased or an object is heated, the volume also increases i.e expands.
Thus, a gas under constant pressure will expand when heated.
Learn more about temperature.
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