1001 Space Earth Nature History Human World Science and Technology Chemistry Materials Force and Energy Heat and Light Electricity and Magnetism Industry Machines Electronics and Computers Cars and Trucks Railways Ships Aircraft Fishing and Agriculture Undersea Exploration

Choose a Page:What happens when colours are mixed?How does the Sun produce light?What is light?How does a vacuum flask work?What is heat?What is colour?How does heat travel?What is temperature?*How do thermometers work?*What is the coldest possible tempe...How fast does light travel?How do our eyes detect light?How do glasses work? How do thermometers work? A liquid-in-glass thermometer has a bulb containing a liquid that expands along a graduated tube to show temperature. The pointer on a bimetallic thermometer moves along as two metals expand at different rates, causing the coil to tighten. The probe of a digital thermometer generates a small electric current as it gets hot. Thermometers measure the degree of hotness of an object, which we call its temperature.   Previous: Back Book: 1001 Section: Science and Technology Chapter: Heat and Light