Boiling And Boiling Lab Report
In this experiment, the behaviour of water during boiling process is observed. When water is heated to boiling temperature at constant volume, different regimes are observed until it reaches to saturation pressure.
If the pressure is above 1.013 bar, the water is supersaturated. The pressure at which boiling occurs is known as saturation pressure. The standard conditions at which water boiling take place are 100C and 1.013 bar. the temperature at which liquid boils into its vapor phase is known as saturation temperature. A direct relationship is between saturation temperature and saturation pressure.
1. Theoretical Background of Experiment
The behaviour of the water while it’s evaporated in close container faces various stages.
“Boiling contender”
• Free conductive heating (no boiling): in this stage, as the heat flux is very low, no boiling occurs. However, there is a slight swirling in the water movement at the bottom as well as phase change which occurs at the free surface as evaporation.
• Onset of nucleate boiling: as heat flux is increased, phase change will occur at the heater surface and vapour of bubbles will formed at the heater and rise to the free surface and later condense, as they have reached the cooler fluid. During this, small bubbles condensing on the surfaces of glass may be seen.
• Nucleate boiling (bubbles arise): as the temperature rises to more than 100C, a huge amount of bubbles raises from the bottom to the top (vigorous
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