a plastic growth is made of forms lab in a salamander & 10 is a mean of steam ->  a glass thermometer is made of alcohol liquid in a tube  a glass thermometer is made of alcohol liquid in a tube & as the steam in a thermometer expands , the width of the steam in that star will decrease ->  if the alcohol liquid in the tube expands, then the height of the alcohol liquid will increase  if the alcohol liquid in the tube expands, then the height of the alcohol liquid will increase & if a spiritual is heated , then the spiritual will expand -> the height of the alcohol liquid changes because alcohol is heated