Charles' law relates the way two gas properties change when another property remains the same. what are the two changing properties in charles' law?
pressure and volume
pressure and temperature
pressure, temperature, and volume
temperature and volume

The answer to your question is: Temperature and volume

Explanation:

Pressure and volume  This option is the incorrect answer Boyle's  law relates Pressure and volume

Pressure and temperature , This option is incorrect Gay Lussac's law relates pressure and temperature

Pressure, temperature, and volume  This option is incorrect, this option is of the general law of gases.

Temperature and volume, this option is correct, Charles' law relates temperature and volume

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.