Gas pressure and temperature

Explain macroscopic gas pressure as the direct result of the continuous motion and collisions of microscopic particles.
Explain qualitatively how varying the temperature of a gas directly affects particle velocity, and subsequently alters the pressure exerted by a fixed mass of gas maintained at a constant volume.
Define absolute zero ( $-273^\circ \text{C}$ ) as the theoretical thermodynamic state characterized by a complete cessation of particle kinetic movement.
Convert temperature measurements seamlessly between the Kelvin and Celsius scales.

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