Which law states that the volume and absolute temperature of a fixed quantity of gas are directly proportional under constant pressure conditions?
O Boyle's law
O Charles's law
O Dalton's law
O Gay-Lussac's law

O Charles's law .

Explanation:

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In this case, since the use of gas laws leads to a good comprehension of how gases behave towards volume, pressure and temperature, we can review that the Boyle's law explains the pressure-volume variation, the Dalton's law the partial pressure effect, the Gay-Lussac's law that of pressure and temperature and the Charles' that of temperature and volume at constant pressure; thus, the answer for the asked question is:

O Charles's law

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