Explain all the forms of water and their interconversion science ncert class 7 chapter 16
Answers
Answer:
The change of state of matter from one state to another state and back to the original state of matter is known as inter-conversion of matter.
Ice to water - Melting
Water to water vapour - evaporation
Water vapour to water - condensation
Water to ice - Freezing
Answer:
1) VAPOURISATION - DEFINITION
Vaporization of an element or compound is a phase transition from the liquid phase to vapor.
Boiling point is the temperature at which liquid changes to vapor. Examples: Boiling of water.Water changes to water vapor at 100
0
C which is melting point of water.
2) FREEZING - DEFINITION
Freezing, or solidification, is a phase transition in which a liquid turns into a solid when its temperature is lowered below its freezing point.Freezing point is the temperature at which liquid changes to solid
Liquid water turning to ice is an example of freezing.
Freezing point of water is 0 °c
3) SUBLIMATION - DEFINITION
Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase.
4) MELTING POINT - DEFINITION
The temperature at which a given material changes from a solid to a liquid, or melts is called as its melting point. Example : Ice melts at 32
o °Fahrenheit or 0 °Celsius.
5) VAPORISATION - EXAMPLE
Conversion of liquid state in the gaseous state in water is called vaporisation.