Question

according to charles’s law, which two variables are directly proportional?
-volume and temperature
-volume and pressure
-pressure and temperature
-temperature and the number of molecules

Answer 1

According to Charles Law the VOLUME if gas varies directly with the absolute temprature under the conditions if constant PRESSURE.
It is VOLUME,and PRESSURE. I hope I'm right and this helps.

Answer 2

Answer: The correct answer is volume and temperature.

Explanation:

Charles' Law states that volume is directly proportional to the temperature of the gas at constant pressure and number of moles of gas.

Mathematically,

$\text{Volume}\propto \text{Temperature}$

Or,

$V\propto T$      (At constant pressure and number of moles)

As, the temperature of the gas increases, volume of the gas also increases and vice-versa.

Hence, the correct answer is volume and temperature.