White glow of a blackbody at 6000 K

Blackbody radiation

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Blackbody radiation (cavity radiation) is the thermal radiation of a blackbody, i.e. a body that absorbs all incident radiation. Find out more about blackbody radiation in this article.
Visible radiation of a light bulb

Stefan–Boltzmann law & Kirchhoff’s law of thermal radiation

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The Stefan-Boltzmann law states that the radiant power of an object in thermal equilibrium is proportional to the fourth power of temperature and directly proportional to its surface! Learn...
Cut through a liquid filled thermometer (liquid-in-metal thermometer)

How does a liquid filled thermometer (liquid-in-metal) work?

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This article provides answers to the following questions, among others: How do a liquid-in-metal thermometers work?Why should the inner diameter of the coiled tube be kept...
Thermal response with cooled and uncooled hand

Temperature scales

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This article provides answers to the following questions, among others: What is temperature in the physical sense a measure for?Which reference points are used as the...
Spectral distribution of the intensity of the radiation of a blackbody (Planck spectrum)

Planck’s law and Wien’s displacement law

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Planck's law describes the radiation emitted by black bodies and Wien's displacement law the maximum of the spectral intensity of this radiation. Learn more about it in this article.
Cut through a gas filled thermometer (gas-in-metal thermometer)

How does a gas filled thermometer (gas-in-metal) work?

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This article provides answers to the following questions, among others: How do gas filled thermometers work?What are the advantages of gas-in-metal thermometers compared to liquid-in-metal...
Bimetal thermometer (spiral type)

How does a bimetallic strip thermometer work?

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This article provides answers to the following questions, among others: How do bimetal thermometers work?Why is the bimetal wrapped into a spiral or a helix?Why are...
Illustration of Brownian particle motion with balls

Temperature and particle motion

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This article provides answers to the following questions, among others: What is the general relationship between the temperature and the particle movement of a substance?Why does...
Illustration des Photonengases in einem Schwarzen Hohlkörper

Thermodynamic derivation of the Stefan-Boltzmann Law

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In this article the Stefan-Boltzmann-Law is to be derived using the laws of thermodynamics. This article provides answers to the following questions,...
Cut through a vapour filled thermometer (vapour-in-metal thermometer)

How does a vapour pressure thermometer (vapour-in-metal) work?

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This article provides answers to the following questions, among others: How do vapor pressure thermometers work?Why do vapor pressure thermometers have a non-linear scale?
Resistance thermometer (Pt100)

How does a resistance temperature detector (resistance thermometer) work?

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This article provides answers to the following questions, among others: How do resistance thermometers work?Why should the measurement current for an RTD be as low as...
Thermographic image of a car

How does a thermal imaging camera work?

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This article provides answers to the following questions, among others: How do thermal imaging cameras work?Why is the thermal image displayed in false colors?