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the pressure and temperature of a fixed mass of gas kept at a constant volume.

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what happens to one variable when the other changes

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what happens to one variable when the other changes

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As the pressure goes up, the temperature also goes up, and vice-versa.

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hydrogen and oxygen combine by volume in the ratio 2:1 to form water.

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Lusaac's law applies to gas help at a constant volume allowing only the pressure and temperature to vary. Therefore, Lussac's Law involves pressure and temperature. It's an direct relationship since as pressure increases, temperature increases as well.

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https://socratic.org/questions/what-is-a-real-life-application-that-demonstrates-gay-lussac-s-gas-law

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Gay-Lussac's law can refer to several discoveries made by French chemist Joseph Louis Gay-Lussac (1778–1850) and other scientists in the late 18th and early 19th centuries pertaining to thermal expansion of gases and the relationship between temperature, volume, and pressure.