The Invisible Bombardment
📖 The Invisible Bombardment
Gas pressure arises from the constant, random bombardment of container walls by gas particles:
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🧠 Memory Aid
Celsius to Kelvin: Add 273. Remember with: "Kelvin is Celsius + 273 — K is above 0, C starts at −273." Or simply: K = C + 273.
Gas pressure particle explanation — the 3-step answer:
- Particles move faster (higher kinetic energy)
- More frequent collisions with walls
- Greater force per collision → higher pressure
Pressure in liquids: "Deeper = Heavier burden above = Higher pressure." The diver analogy: the deeper you swim, the more water is pressing down on you from above.
Absolute zero: −273°C. Think "−273 is the floor — you can't go lower." Like the lowest floor of a building. Everything above is a positive Kelvin value.
Now try it yourself
Quiz · Question 1 of 19
A sealed gas container is heated. What happens to the pressure of the gas inside?
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This topic in real past papers
Every real exam question we've found on gas pressure & temperature, with a full worked answer.