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I suppose you mean the formula for the variation in pressure. The simplest expression of this is, at a fixed temperature,and for a given mass of gas, pressure x volume = constant. This is known as Boyle's Law.
If the temperature is changing, then we get two relations:
1. If the pressure is fixed, volume = constant x temperature (absolute)
2. If the volume is fixed, pressure = constant x temperature (absolute)
These can be combined into the ideal gas equation Pressure x Volume = constant x Temperature (absolute), or PV = RT where R = the molar gas constant. (Absolute temperature means degrees kelvin, where zero is -273 celsius)
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