Table of Contents
How does a thermometer tell the temperature?
How does a thermometer tell the temperature? A thermometer measures temperature through a glass tube sealed with mercury that expands or contracts as the temperature rises or falls. As temperatures rise, the mercury-filled bulb expands into the capillary tube. Its rate of expansion is calibrated on the glass scale.
Why does a thermometer measure temperature and not heat?
Despite its name, however, a thermometer does not actually record heat, but rather temperature. Temperature is a measure of the average kinetic energy of the molecules within a substance. When you record the temperature of something, you are making a statement about how fast the molecules are moving.
How does zeroth law of thermodynamics leads to temperature?
The zeroth law of thermodynamics states: If a body A and a body B are both in equilibrium with each other; then a body C which is in thermal equilibrium with body B will also be in equilibrium with body Aand the temperature of body C is equal to the temperature of body A. The Zeroth law of thermodynamics.
Who does a thermometer work?
Both mercury and alcohol grow bigger when heated and smaller when cooled. Inside the glass tube of a thermometer, the liquid has no place to go but up when the temperature is hot and down when the temperature is cold. Numbers are placed alongside the glass tube that mark the temperature when the line is at that point.
Why is sensible heat different from the air temperature?
Sensible heat causes change in temperature due to contact with colder or warmer air of surfaces. Latent heat is the energy absorbed by or released from a substance during a phase change from a gas to a liquid or a solid or vice versa.
What is thermometer short answer?
A thermometer is a tool that measures temperature — how hot or cold something is. Thermometers are used to see if you have a fever or tell you how cold it is outside. Made up of thermo (heat) and meter (measuring device), the meaning of the word thermometer is pretty straightforward.
Why is a thermometer important?
Thermometers are used to measure the temperature and this is a very important part of weather forecasting. Many thermometers come in a glass tube that contains a liquid, usually mercury or alcohol. The liquid expands when it’s hotter and contracts when it is colder.
Why do we use a thermometer?
A thermometer is a tool that measures temperature — how hot or cold something is. Thermometers are used to see if you have a fever or tell you how cold it is outside. Doctors use thermometers to check your body temperature — a very high or low body temperature means you’re sick.