This instrument can be used to demonstrate the general gas law:
p ∙ V = const. (for T, n constant)
p = const. ∙ T (for V, n constant)
V = const. ∙ T (for p, n constant)
Design of experiments
The two main components of the gas law instrument are a variable gas volume with an adjustable temperature - and a sensitive manometer.
The gas volume is divided into a fixed and a variable part, with the variable part corresponding to the measuring range of the manometer. The variable volume is formed by a plastic syringe controlled by a rotating handle.
The manometer is a liquid manometer with demineralised water as the liquid for the manometer. With a ruler for reading the positions of the liquid surfaces, it is possible to measure pressure differences in a range of about ± 900 mm water column (about ± 9000 Pa). The precision of the measurement is about 1 millimetre water column - i.e. a relative accuracy around 1-2 ‰.
While developing the gas law instrument, we tried to minimise the ‘dead’ gas volume that cannot be kept at the same temperature as the rest. For example, we use a connecting hose between the gas volume and the gauge with an internal volume of only 1 ml.
Additional material
For a complete practical, the gas law instrument should be combined with the following items, which should be purchased separately:
Beaker low model 2L
Immersion heater, 230 V, Schuko plug (or equivalent)
Immersion heater (or equivalent)
Thermometer (or equivalent)
Tripod base (3 pcs.)
Tripod pole (3 pcs.)
Double clamp (3 pcs.)|
Demineralised water
Faucet/sealing/vacuum grease
p ∙ V = const. (for T, n constant)
p = const. ∙ T (for V, n constant)
V = const. ∙ T (for p, n constant)
Design of experiments
The two main components of the gas law instrument are a variable gas volume with an adjustable temperature - and a sensitive manometer.
The gas volume is divided into a fixed and a variable part, with the variable part corresponding to the measuring range of the manometer. The variable volume is formed by a plastic syringe controlled by a rotating handle.
The manometer is a liquid manometer with demineralised water as the liquid for the manometer. With a ruler for reading the positions of the liquid surfaces, it is possible to measure pressure differences in a range of about ± 900 mm water column (about ± 9000 Pa). The precision of the measurement is about 1 millimetre water column - i.e. a relative accuracy around 1-2 ‰.
While developing the gas law instrument, we tried to minimise the ‘dead’ gas volume that cannot be kept at the same temperature as the rest. For example, we use a connecting hose between the gas volume and the gauge with an internal volume of only 1 ml.
Additional material
For a complete practical, the gas law instrument should be combined with the following items, which should be purchased separately:
Beaker low model 2L
Immersion heater, 230 V, Schuko plug (or equivalent)
Immersion heater (or equivalent)
Thermometer (or equivalent)
Tripod base (3 pcs.)
Tripod pole (3 pcs.)
Double clamp (3 pcs.)|
Demineralised water
Faucet/sealing/vacuum grease
Properties
- F180700