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Mihsaba›Charles’s Law Calculator

Charles’s Law Calculator

Calculate final ideal-gas volume at constant pressure from initial volume and two temperatures, with Celsius-to-Kelvin handling.

These are ideal thermal/gas models. Real material properties and gases can vary with temperature, pressure and phase.

How to use

Charles’s law links a fixed gas volume to absolute temperature at constant pressure. Celsius values are converted to kelvin before applying the ratio.

  1. Enter V₁.
  2. Enter T₁ and T₂.
  3. Choose °C or K.
  4. Review V₂ and kelvin temperatures.

How it is calculated

V₁/T₁=V₂/T₂ using absolute temperatures

Example

Example: 1 L at 20°C becomes about 1.273 L at 100°C at constant pressure in the ideal model.

Important notes

Absolute temperature is required; values at or below 0 K are nonphysical. The law is an ideal-gas approximation at constant pressure and amount.

Frequently asked questions

Why not use °C directly in the ratio?

The relation requires an absolute temperature scale.

Must pressure be constant?

Yes.

Does doubling kelvin double volume?

Yes in the ideal model at constant pressure/amount.