Question
Download Solution PDFWhich of the following fluids has very low vapor pressure?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Vapour pressure:
- Vapour pressure is the pressure exerted by a vapour when the vapour is in equilibrium with the liquid or solid form, or both, of the same substance.
- Vapour pressure is a measure of the tendency of a material to change into a gaseous or vapour state.
- Vapour pressure, also known as vapour equilibrium pressure, can be defined as the pressure exerted (in a system featuring thermodynamic equilibrium) by a vapour with its condensed phases (solid or liquid) in a closed system at a given temperature.
- Temperature is the only factor that affects vapour pressure. The vapour pressure of a liquid is independent of the volume of liquid in the container, whether one litre or forty litres.
- As the temperature rises, vapour pressure rises as well.
Vapour pressure of mercury:
- The vapour pressure of mercury is 0.0017 mmHg at 25 °C which is one of the lowest among liquids.
- For water, it is 23.8 mmHg at 25 °C.
- The advantage of this low vapour pressure combined with high density is that we can use mercury in pressure measurement devices for correct readings.
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