With the help of a diagram describe an activity to show that the states of water can be changed from solid to liquid and then to its ggaseous state.Explain the terms latent heat of fusion and latent heat of vapourisation. How will you change the water from its gaseous stste to its liquid state suggest a simple activity?
Changing states of water:
Take an ice cube in spoon, heat it gently. The ice cube will melt to form water. On further heating the water will boiled off to form vapours (gaseous state).
Latent heat of Fusion : It is the heat required to change 1 kg of a solid substance into liquid state at the melting point of the substance. For example, amount of heat required to melt ice at 0°C into water at 0°C, will be known as the Latent Heat of Fusion of ice.
Latent heat of Vaporization : It is the heat required to change 1 kg of a liquid substance into gaseous state at atmospheric pressure, at the boiling point of the substance. For example, amount of heat required to vaporize water at 100°C into the vapor state at 100°C, atmospheric pressure, will be known as the Latent Heat of Vaporisation of water.
Water can be changed from gaseous state to liquid state by condensation that is lowering down the temperature of water vapours. This can be done by very simple activity that you also observe in daily life. Take out chilled water bottle from refrigerator. After few minutes you will observe liquid droplets outside the surface of bottles. These are water vapours in air whose temperature is lowered due to chilled water bottle.
Take an ice cube in spoon, heat it gently. The ice cube will melt to form water. On further heating the water will boiled off to form vapours (gaseous state).
Latent heat of Fusion : It is the heat required to change 1 kg of a solid substance into liquid state at the melting point of the substance. For example, amount of heat required to melt ice at 0°C into water at 0°C, will be known as the Latent Heat of Fusion of ice.
Latent heat of Vaporization : It is the heat required to change 1 kg of a liquid substance into gaseous state at atmospheric pressure, at the boiling point of the substance. For example, amount of heat required to vaporize water at 100°C into the vapor state at 100°C, atmospheric pressure, will be known as the Latent Heat of Vaporisation of water.
Water can be changed from gaseous state to liquid state by condensation that is lowering down the temperature of water vapours. This can be done by very simple activity that you also observe in daily life. Take out chilled water bottle from refrigerator. After few minutes you will observe liquid droplets outside the surface of bottles. These are water vapours in air whose temperature is lowered due to chilled water bottle.