Thermometers are another example of an application of thermal expansion -- most contain a liquid which is constrained to flow in only one direction -LRB- along the tube -RRB- due to changes in volume brought about by changes in temperature .

Thermometers are an example of an application of thermal expansion -- they contain a liquid which is constrained to flow in only one direction -LRB- along the tube -RRB- due to changes in volume brought about by changes in temperature .
