Which law was studied in the year 1787, in which it was said that the volume of a gas increases with its absolute temperature and if its absolute temperature decreases, then its volume will decrease?

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**Solution:**

1. Charles's law states that for a fixed amount of gas at constant pressure, the volume of the gas is directly proportional to its absolute temperature.

2. Mathematically, it can be expressed as:
   $$ V \propto T $$
   or
   $$ \frac{V}{T} = 	ext{constant} $$

3. This means if the absolute temperature increases, the volume increases, and if the absolute temperature decreases, the volume decreases.

4. This law was studied and formulated by Jacques Charles in the year 1787.

5. Other laws mentioned:
   - Boyle's law relates pressure and volume at constant temperature.
   - Dalton’s law relates to partial pressures of gases.
   - Avogadro’s law relates volume and number of moles at constant temperature and pressure.

**Answer:** Charles's law

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