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Pressure, volume and temperature, and moles of gas are the four principal variables to describe a gas (for example, see related questions on Ideal Gas Law and others). The standard units are: Pressure: atmospheres (atm) Volume: liters (L) Temperature: Kelvin (K) Number of moles are measure in, well, moles.

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Variables used to describe a gas include pressure (P), volume (V), temperature (T), and number of moles (n). Pressure is typically measured in atmospheres (atm) or Pascals (Pa), volume in liters (L) or cubic meters (m^3), temperature in Kelvin (K), and amount of substance in moles.

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Q: What variables and units are used to describe a gas?
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