MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Thermal expansion of liquids. Laboratory apparatus designed to demonstrate the thermal expansion of liquids. The round-bottomed flask at bottom is empty, but can be filled with a liquid. Running upwards from the flask is a microbore tube made of glass. The microbore is the narrow opening running up the centre of the tube. Here, a small amount of red liquid can be seen in the microbore at upper centre. Heating or cooling any liquid is the reservoir will cause it to expand or contract and move up or down the microbore. The expansion is relatively small, and it can only be seen when a narrow tube is used. The same principle is used in mercury thermometers to measure temperature changes as the mercury moves up and down a microbore.
Model release not required. Property release not required.