How Temperature and Pressure Are Linked (Absolute Temperature)

⚙️ How Temperature and Pressure Are Linked (Absolute Temperature)

For a fixed mass of gas at constant volume, pressure is proportional to absolute temperature:

p ∝ T (constant volume)

This means if you double the absolute temperature (in Kelvin), you double the pressure. But temperature must be in Kelvin, not Celsius:

• Absolute zero (0 K = −273°C): The temperature at which particles have minimum kinetic energy and gas pressure would theoretically be zero.
• Conversion: T (K) = T (°C) + 273
• So 100°C = 373 K, and 0°C = 273 K

Why Kelvin? At −273°C, particles theoretically stop moving (minimum possible kinetic energy). This is the lowest possible temperature — absolute zero. The Kelvin scale starts here, which is why pressure is directly proportional to Kelvin temperature.