Absolute Zero
2 guided lessons · 18 checks · 5. Solids, Liquids and Gases → Ideal Gases
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Why absolute zero exists
Cool a gas and its particles slow; keep cooling and a limit appears — the temperature at which particle motion reaches its minimum and cannot be reduced further. Below that point there is simply no slower state to reach: absolute zero, at −273 °C.
What you know already
Temperature has a floor, and the kinetic model tells you where: particles slowed to the minimum possible motion. That floor is absolute zero at −273 °C, the zero of the Kelvin scale — and this note drills the two-way conversion between kelvin and degrees Celsius.
Key points of understanding
- Absolute zero is the lowest possible temperature, at −273 °C.
- At absolute zero the particles have the minimum kinetic energy possible.
- Colder-than-absolute-zero is impossible because particle motion cannot be reduced below its minimum.
- Extrapolating the pressure–temperature graph of a fixed gas to zero pressure lands at −273 °C.
- At absolute zero an ideal gas would exert no pressure from wall collisions.
At absolute zero, or −273 °C, particles will have no net movement. It is therefore not possible to have a lower temperature
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1.Why absolute zero exists
Cool a gas and its particles slow; keep cooling and a limit appears — the temperature at which particle motion reaches its minimum and cannot be reduced further. Below that point there is simply no slower state to reach: absolute zero, at −273 °C.
At absolute zero, or −273 °C, particles will have no net movement. It is therefore not possible to have a lower temperature
Key points
- Absolute zero is the lowest possible temperature, at −273 °C.
- At absolute zero the particles have the minimum kinetic energy possible.
- Colder-than-absolute-zero is impossible because particle motion cannot be reduced below its minimum.
Guided content from the SME authoring corpus — note rn_ppyHPvm5ynFYPsg8, pinned at 8788fc85a2c1 · promoted SyllabAI/syllabai-resources b3caaaa90c5e
