Which of the following procedures is used when refining petroleum? increase the temperature of the oil. decrease the temperature of the oil. increase the pressure of the oil. decrease the pressure of the oil.

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Those are different gas lawshere is a brief description of themcharles's law states that volume and temperature are directly proportional to each other as long as pressure is held constant.  boyle's law asserts that pressure and volume are inversely proportional to each other at fixed temperature.gay-lussac's law introduces a direct proportionality between temperature and pressure as long as it is at a constant volume.    source:

For apex it is hydroxyl