how a thermometer works


How A Thermometer Works?

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.

How does a thermometer work for fever?

The thermometer scans the surface of the forehead. These are sometimes used to screen for fever. If the temperature is higher than normal (greater than 101° F), it needs to be taken with a more accurate kind of thermometer. Temporal artery thermometers should not be used on infants.

Which principle best explains how this thermometer works?

Answer: The thermometer works on the principle of “zero’th law of Thermodynamics“. This law states that if two bodies are in thermal equilibrium with another body, then they must also be in thermal equilibrium with each other.

How do thermometers detect?

Infrared thermometers employ a lens to focus the infrared light emitting from the object onto a detector known as a thermopile. The thermopile is nothing but thermocouples connected in series or parallel. When the infrared radiation falls on the thermopile surface, it gets absorbed and converts into heat.

What is your normal body temperature?

The average normal body temperature is generally accepted as 98.6°F (37°C). Some studies have shown that the “normal” body temperature can have a wide range, from 97°F (36.1°C) to 99°F (37.2°C). A temperature over 100.4°F (38°C) most often means you have a fever caused by an infection or illness.

Is 37.5 a fever?

A high temperature is usually considered to be 38C or above. This is sometimes called a fever. Many things can cause a high temperature, but it’s usually caused by your body fighting an infection.

On what principle is the thermometer constructed?

Thermometers are based on the principle of expansion in liquids.

Who invented the first thermometer?

1612: Santorio Santorio – the first thermometer

The Italian, Santorio Santorio (1561-1636) is generally credited with having applied a scale to an air thermoscope at least as early as 1612 and thus is thought to be the inventor of the thermometer as a temperature measuring device.

How does temperature affect the movement of water molecules?

Temperature causes water molecules to move more quickly, because each individual molecule has more energy as it gets hotter (according to Kinetic molecular theory). If you get water hot enough, the molecules move so much that the hydrogen bonds that hold them together start to break and the water becomes a gas …

What does temperature really measure?

average kinetic energy
Temperature is a measure of the average kinetic energy of the particles in an object. When temperature increases, the motion of these particles also increases.Sep 27, 2017

What’s the temp of absolute zero?

−273.15 °C
absolute zero, temperature at which a thermodynamic system has the lowest energy. It corresponds to −273.15 °C on the Celsius temperature scale and to −459.67 °F on the Fahrenheit temperature scale.

Can a thermometer measure 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.

Is 36.9 a fever?

A normal adult body temperature, when taken orally, can range from 97.6–99.6°F, though different sources may give slightly different figures. In adults, the following temperatures suggest that someone has a fever: at least 100.4°F (38°C) is a fever. above 103.1°F (39.5°C) is a high fever.

What is a high temp for Covid?

Symptoms of coronavirus

continuous cough. fever/high temperature (37.8C or greater) loss of, or change in, sense of smell or taste (anosmia)

Is 37.2 a fever?

The following thermometer readings generally indicate a fever: Rectal, ear or temporal artery temperature of 100.4 (38 C) or higher. Oral temperature of 100 F (37.8 C) or higher. Armpit temperature of 99 F (37.2 C) or higher.

How long does temperature last with Covid?

If you have mild disease, fever is likely to settle within a few days and you are likely to feel significantly better after a week – the minimum time at which you can leave self-isolation is ten days.

Does paracetamol bring down a fever?

How does paracetamol work? Paracetamol seems to work by blocking chemical messengers in the brain that tell us we have pain. Paracetamol also reduces fever by affecting the chemical messengers in an area of the brain that regulates body temperature.

Can you have a fever without a high temperature?

Feeling feverish or hot may be one of the first signs of having a fever. However, it’s also possible to feel feverish but not be running an actual temperature. Underlying medical conditions, hormone fluctuations, and lifestyle may all contribute to these feelings.

Why mercury is used in thermometer?

Mercury is the only one in liquid state at room temperature. It’s used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it’s used in a thermometer. It also has a high boiling point which makes it very suitable to measure higher temperatures.

Which law is used in thermometer?

The Zeroth Law of Thermodynamics

The Zeroth Law of Thermodynamics defines temperature and makes thermometers possible.

Which liquid is used in thermometer?


In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked on the tube. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. Mercury thermometers can be used to determine body, liquid, and vapor temperature.

What are 3 types of thermometers?

What Are the Different Ways a Thermometer Can Be Used?

  • Axillary Thermometers (under your arm)
  • Oral Thermometers (under your tongue)
  • Tympanic Thermometers (in your ear)
  • Rectal Thermometers (in your rectum)
  • Temporal Artery or Infrared Thermometers (across your forehead)

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.

What are the two types of thermometer?

Types of thermometer

  • Digital thermometers. Digital thermometers are quick to use, reasonably accurate and can be used under the armpit (always use the thermometer under the armpit with children under 5). …
  • Ear (or tympanic) thermometers. …
  • Infared thermometers. …
  • Strip-type thermometers. …
  • Mercury thermometers.

What happens to the speed of the particles if the temperature goes up?

With an increase in temperature, the particles move faster as they gain kinetic energy, resulting in increased collision rates and an increased rate of diffusion. … With an increase in temperature, the particles gain kinetic energy and vibrate faster and more strongly.

What causes the difference in the temperature of gases?

The temperature of a gas is a measure of the average translational kinetic energy of the molecules. In a hot gas, the molecules move faster than in a cold gas; the mass remains the same, but the kinetic energy, and hence the temperature, is greater because of the increased velocity of the molecules.

How does heat cause movement?

Heat moves in three ways: Radiation, conduction, and convection. Radiation happens when heat moves as energy waves, called infrared waves, directly from its source to something else. … When the heat waves hits the cooler thing, they make the molecules of the cooler object speed up.

At what temperature is a fever?

Despite the new research, doctors don’t consider you to have a fever until your temperature is at or above 100.4 F. But you can be sick if it’s lower than that.

What are the 4 types of temperature?

The Four Types of Temperature Scales

  • Fahrenheit Scale. ••• The Fahrenheit scale of temperature is the common form of temperature measurement used in the United States and some parts of the Caribbean. …
  • Celsius Scale. ••• …
  • Kelvin Scale. ••• …
  • Rankine Scale. •••

What is temperature explain?

Temperature is the measure of hotness or coldness expressed in terms of any of several scales, including Fahrenheit and Celsius. Temperature indicates the direction in which heat energy will spontaneously flow—i.e., from a hotter body (one at a higher temperature) to a colder body (one at a lower temperature).

What is the coldest place on Earth?

Oymyakon is the coldest permanently-inhabited place on Earth and is found in the Arctic Circle’s Northern Pole of Cold.

What is the hottest thing in the universe?

The hottest thing in the Universe: Supernova The temperatures at the core during the explosion soar up to 100 billion degrees Celsius, 6000 times the temperature of the Sun’s core.Nov 12, 2021

What temperature is not possible?

zero kelvin
At the physically impossible-to-reach temperature of zero kelvin, or minus 459.67 degrees Fahrenheit (minus 273.15 degrees Celsius), atoms would stop moving. As such, nothing can be colder than absolute zero on the Kelvin scale.Jan 3, 2013

Which color has the most energy using thermometer?

red light has the least energy and blue light has the most energy.

How Do We Tell Temperature?

How does a Thermometer Work | How Stuff Works | How Devices Work in 3D | Science For Kids

Fahrenheit to Celsius: History of the thermometer

The Mercury Thermometer: Where did it come from? | Stuff of Genius

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