Pressure and temperature must be held constant for Avogadro's law to be true.
Avogadro's law may be defined as a law that states that equal volumes of different gases contain an equal number of molecules under the situation of constant temperature and pressure.
According to Avogadro's law, the volume and amount of gas are directly proportional if the temperature and pressure of the surrounding environment remain constant.
Therefore, it is well described above.
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