# Questions tagged [temperature]

It's the physical property that indicates the degree/intensity of heat present in a substance or an object. It can be expressed and measured according to various scales.

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### Major loss of heat in solid body full contact heat transfer

I have the following piece of laboratory equipment: magnetic stirrer with hot plate. I set it to 60 degrees Centigrade and put this metal bowl on it: After a bit I measured the temperature of the ...
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### Relationship between viscosity and temperature

I'm a high school student, and I am interested in fluid viscosity. I was doing an experiment, and I got some data points. Following are some of them. Here,x1 is for temperature(in kelvin), and x2 is a ...
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### How can the Gibbs free energy equation be at constant temperature and pressure?

I have read that the equation $\Delta G = \Delta H-T\Delta S$ is valid only at constant temperature and pressure. However, $\Delta H=0$ in an isothermal process which would give $\Delta G = -T\Delta S$...
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### Understanding temperature drop within throttling processes

I am studying a particular throttling process (https://en.m.wikipedia.org/wiki/Isenthalpic_process, https://en.m.wikipedia.org/wiki/Joule%E2%80%93Thomson_effect): cryogenic flow going through an ...
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### How can the temperature of the surroundings be constant during a reversible thermodynamic process?

I am having trouble reconciling the following statements I have recently learned about thermodynamics: The temperature of the surroundings is taken to be constant (with only infinitesimal changes) ...
1 vote
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### Temperature rising of solar collector

I would like to calculate the heating of a polyethylene solar collector as a result of the sun's radiation. the collectors are uncovered collectors. Suppose I have a certain intensity $I$ of solar ...
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### Final temperature of a mixture of water and ice in a copper container

Lets say I have ice of mass $m_i$ and initial temperature $T_i$ and specific heat $s_i$ . And I have water of mass $m_w$ and initial temperature $T_w$ and specific heat $s_w$ . I have put both this ...
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### Could a window mounted wet cloth sheet chill a room?

Assuming there is a light wind, that construction is partly shaded and a constant water pouring and evaporation of the material is occurring due to the breeze.
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### How hot can steam be?

The title really says it all. How hot can steam (gaseous form of water) be before it ceases to be steam. I'm assuming that at some point the molecular bonds will give way, though I might of course be ...
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### Is high temperature **required** for nuclear fusion?

Tl;dr: Can fusion be achieved only by speeding up particles to high enough speeds to smash into each other? I know that it is necessary for protons, or any oppositely-charged particles for that ...
1 vote
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### Optimal temperature for Mpemba Effect

Is there an optimal temperature for the Mpemba Effect? If so, what is it? If a specific example is needed: There is a 100 milliliter sphere of water floating in air at -10 °C. At what initial ...
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### The derivation of the Planck distribution

I am trying to understand the derivation of the Planck distribution and black body radiation. In the Wikipedia derivation of the Planck distribution, the photons confined within a cubic box, are ...
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### Why are higher frequencies amplified less by filling a bottle with warmer water instead of colder water?

Out of curiosity I was trying to figure out what makes the sound of hot water versus cold water filling a bottle different, but I'm unable to find any explanation as to why such differences occur. ...
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$$\eta=a\exp\frac{B}{RT}$$I'm a high school student, interested in fluid dynamics. I was studying the relationship between viscosity and temperature, and I understood that when liquid heats up, its ...
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### Degrees of Freedom of water and $\rm CO_2$ at high temperatures

How do I calculate the degrees of freedom for $\rm CO_2$ and water at high temperatures? I'm confused because I know $\rm CO_2$ is linear while $\rm H_2O$ is nonlinear, and am wondering how this would ...