Match the following: a. Air exerts p. is important for the growth of plants b. Inflated balloon q. pressure in all directions c. Oxyacetylene flame r. occupies space d. Nitrogen s. is used for welding of metals

Air exerts pressure in all directions. It is one of the properties of the air. An example is the balloon filled with air. The amount of pressure applied by air can be measured as atmospheric presssure. Inflated balloon occupies space. Inflated balloon occupies spac e because it has an empty space. The molecules of gas are very free to move around as there is enough free space for it to travel. Oxygen is used in an oxyacetylene flame which is used for welding of metals. Welding of metals is important in many cases such manufacturing of helmets, earplugs, etc. Soil also contains air in it. Plants absorb nitrogen from the soil. a. Air exerts q. pressure in all directions b. Inflated balloon r. occupies space c. Oxyacetylene flame s. is used for welding of metals d. Nitrogen p. is important for the growth of plants

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New Trends in Science>Chapter 8 - Air>Exercise>Q C

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Oxygen prevents the skin from becoming dry and scaly.

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Important Questions on Air

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New Trends in Science>Chapter 8 - Air>Exercise>Q C

Carbon dioxide gas is required for combustion of fuel.

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New Trends in Science>Chapter 8 - Air>Exercise>Q D

Match the following:

a. Air exerts	p. is important for the growth of plants
b. Inflated balloon	q. pressure in all directions
c. Oxyacetylene flame	r. occupies space
d. Nitrogen	s. is used for welding of metals