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 able to easily read the thermometer.Know More
Alcohol thermometers are considered much safer than the once popular mercury thermometers, but they are considered slightly less durable because the alcohol evaporates from the thermometer over time.
The mercury in mercury thermometers is poisonous if the thermometer breaks. Old thermometers must be properly disposed of to prevent environmental contamination. The Environmental Protection Agency (EPA) recommends that the use of mercury thermometers be avoided and that existing mercury thermometers be properly retired.Learn more about Chemistry
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 are heated, they expand. Common types of liquid thermometers use mercury, toluene or less toxic biodegradable liquids.Full Answer >
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. Temperature on a glass thermometer can be measured in Fahrenheit, Celsius or Kelvin.Full Answer >
Nitrogen is a liquid when it is cooled to a temperature between minus 346 degrees Fahrenheit and minus 320.44 degrees Fahrenheit. Liquid nitrogen resembles water when it boils, but when it is colder than minus 346 degrees, it turns into a solid.Full Answer >
In paper chromatography, a test sample is dotted onto a piece of paper, placed in a liquid that mobilizes its components separately and inspected to determine the component's final positions. Depending on the type of liquid used, the underlying mechanism for paper chromatography may involve the test sample's preference for dissolving in the solvent or the thin layer of water bound to the cellulose fibers in the paper.Full Answer >