Physics
What is matter? What is it composed of?
Heat Energy
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Answer
A matter is something that has mass, occupies space and can be perceived by our senses. It is composed of tiny particles called molecules.
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Related Questions
Write true or false for each statement:
(a) Evaporation is rapid on a wet day.
(b) Evaporation takes place only from the surface of a liquid.
(c) All molecules of a liquid take part in the process of evaporation.
(d) Temperature of a liquid rises during boiling or vaporization.
(e) All molecules of a liquid take part in boiling.
(f) Boiling is a rapid phenomenon.
(g) All solids expand by the same amount when heated to the same rise in temperature.
(h) Telephone wires are kept tight between the two poles in winter.
(i) Equal volumes of different liquids expand by different amounts when they are heated to the same rise in temperature.
(j) Solids expand the least and gases expand the most on being heated.
(k) A mercury thermometer makes use of the property of expansion of liquids on heating.
(l) Kerosene contracts on heating.
Match the following:
Column A Column B (a) Blowing air increases (i) increase in inter-molecular separation (b) Increase in pressure increases (ii) pendulum of a clock (c) Thermal expansion (iii) cooking utensils (d) Invar (iv) boiling point (e) Pyrex glass (v) evaporation Do all the molecules of a liquid take part in evaporation? If not, explain your answer.
No heat is supplied to a liquid during evaporation. How does then the liquid change into its vapour?