Question

Answer the following questions in short
1. Define matter.
2. State why solids are hard.
3. Mention three properties of air.
4. What do you understand by expansion of ar?
5. State any three uses of air.
6. Which gas is essential for burning?
7 How do vehicles contribute to air pollution?
the following questione​

Answer 1

1. anything that occupies space and has mass
2. because the molecules are tightly packed
3. they can flow , they can be compressed and they have lest intermolecular force of attraction
4. gasses expands on heating
5. breathing , respirations and climate change
6. oxygen
7. the vehicle use fule and burn it which produce a harmful gas which leds to air pollution

Answer 2

Answer:1) Matter, material substance that constitutes the observable universe and, together with energy, forms the basis of all objective phenomena.

.2) Solids are hard because the molecules that make up the solid are closely fitted together, thus leaving little or no room to manipulate the solid 

.3)

4) Air inside can freely expand or contract, but heat and air molecules do not cross the boundary. ... A rising parcel of air expands because the air pressure falls with elevation. • This expansion causes the air to cool.

5)

a ) Sustain Life and Growth. Air consists one of the main life-sustaining gas called oxygen. ...

b ) Combustion. Apart from this, air supports burning or combustion. ...

c) Temperature Control. ...

6) oxygen

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