What will its pressure be at W degrees Celsius if the volume does not change?

To determine the pressure at W degrees Celsius with a constant volume, you can use the ideal gas law, where pressure is directly proportional to temperature in Kelvin. Convert W degrees Celsius to Kelvin by adding 273.15, then apply the formula ( P \propto T ). If the initial pressure and temperature are known, you can calculate the new pressure using the ratio of the new temperature to the initial temperature.