constant pressure gas thermometer boiling point

The higher the temperature the greater the resistance. This thermometer depends on the variation in the electrical resistance of a conductor with temperature. A constant volume gas thermometer records pressure of a body as 300mm of Hg at 0 0C and 400mmHg at 100 0 Calculate the temperature of the body when the gas pressure reads 350mmHg.Calculate the temperature of the body when the gas pressure reads 300mmHg. The pressure at 100 0C is also gotten by placing it over stem.Ī constant volume gas thermometer records pressure of a body as 250mm of Hg at 0 0C and 350mmHg at 100 0C. To use the thermometer it must be calibrated by getting the gas pressure at 0 0C, when the bulb containing is placed in pure melting ice. P=h+H, where H is the atmospheric pressure.īut when the level of mercury is lower, then When the level of mercury in A is higher than that of D, then The pressure of gas is read from the manometer. The right side of AC of the manometer is moved up and down in order to bring the mercury level on the other side to its original position D to ensure that the volume of gas is constant.

On heating the bulb to a specific temperature, the gas expands and pushes the mercury down to tube A and consequently mercury level at C rises. The constant – volume gas thermometer depends on the variation in the pressure of a gas at constant volume with changes in the temperature of the gas.

List four advantages of mercury over alcohol as a thermometric thermometer.

State three desirable properties of a thermometric liquid.

The lower end of Y indicates the minimum temperature.

When the temperature falls the alcohol contracts and moves in anticlockwise direction, the mercury pushes steel index Y up. The maximum temperature is read from the lower end of x. When the temperature rises, since alcohol expands more than mercury, The alcohol expands and flows in clockwise direction and the mercury pushes steel index x upwards. It contains alcohol at two upper part of the bent tube and mercury below. (iii) The Maximum and minimum thermometer is used to measure the maximum and minimum temperatures of the day. (ii) The school thermometer is used in school laboratory, it ranges from 0 0C – 100 0C.

Constant pressure gas thermometer boiling point