Question 1

What is Charles's Law?

Accepted Answer

Charles's Law states that for a fixed amount of gas at constant pressure, the volume is directly proportional to the absolute temperature. If you heat a gas, it expands; if you cool it, it contracts.

Question 2

Why must temperature be in Kelvin?

Accepted Answer

Charles's Law requires absolute temperature because the volume of an ideal gas is directly proportional to absolute temperature. Using Celsius or Fahrenheit would give incorrect results because they have arbitrary zero points. 0 K (absolute zero) is the true zero of temperature.

Question 3

How do I convert Celsius to Kelvin?

Accepted Answer

Add 273.15 to the Celsius temperature: K = °C + 273.15. For example, 25°C = 298.15 K, and 100°C = 373.15 K.

Question 4

What happens at absolute zero?

Accepted Answer

At absolute zero (0 K = -273.15°C), Charles's Law predicts zero volume. In reality, gases liquefy before reaching absolute zero, so the law no longer applies. Absolute zero is a theoretical limit that can never be reached.

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