Consider a system to be a certain mass of gas contained in a cylinder with movable piston as shown in the figure.
The state of the gas and hence its internal energy can be changed by
Text Solution
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When the cylinder is put in contact with a body at a higher temperature than that of gas, then the temperature difference will cause a flow of energy (heat) from hotter body to gas. This increases the internal energy of the gas.
Similarly, if we push the piston down, i.e. do some work on the system, it also results in increasing the internal energy of the gas.
Thus, internal energy or static of the gas can be changed by either of the ways mentioned in options and .
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