5.3 How does expansion and contraction of matter affect us?

TB 125: The .........................of matter increases during expansion.

TB 125: The .........................of matter decreases during contraction.

TB 125: After heating, the metal ball ...........................

TB 126: When the bottle of coloured water is heated, the coloured water expands and ............... .......... the glass tube.

TB 126: When the flask of coloured water is placed in cold water, the coloured water .........................................................................................................

TB 126: The air in the bottle ............................

TB 127: This is a ................ ..................that is a device that makes use of expansion and contraction of solids.

TB 127: This is a bimetallic strip is made of ...................................................................

• iron and steel

• brass and iron

TB 127: When heated, the brass ................................ ......................... than the iron strip, causing the bimetallic strip to bend.

TB 127: Which statement is true?

• iron expands more than brass

• brass expands more than iron