The red liquid inside of a thermometer is alcohol. When the temperature changes, the alcohol expands, providing a reading based on the thermometer's scale. Red dye is used to color the clear alcohol so that someone is ab... More »

A liquid thermometer works by using the thermal expansion of a liquid within a capillary tube to measure temperature. The precision of this method varies by the liquid used, but all use the fact that when most liquids ar... More »

The liquid in a glass thermometer, either colored alcohol or mercury, expands as it heats and condenses as it cools. In a thermometer, the liquid cannot expand outward and the only place it can go is up or down. Temperat... More »

The amount of mercury in a thermometer is about 3 grams. A mercury thermometer is used to measure the body temperature. More »

Ambient temperature is the temperature that you see on the thermometer when using it outside. This reading does not take into account humidity or wind speed. More »

To read a thermometer, keep the thermometer in a vertical position so the liquid in the tube is upright. Keep eyes level with the top of the liquid in the tube. Avoid over-handling the thermometer as heat from another ob... More »

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The process by which a solid becomes a liquid is called melting. Melting is one of the six phase transitions by which matter undergoes a change in state. More »