is it possible to have heat without light? and vice versa?

Question

Please provide a theorum or something stating either way. thankyou

Answer 1

I don't mean to offend anyone, but I think I should say that some of the previous answerers used wrong concepts to answer the question. Light does not include all types of electromagnetic radiation. So even though some of the answers are on the right track, they are conceptually wrong. I explained below the difference. Part of being able to communicate physics is to know the conventions established, that includes names and categories.

Now, back to the main question

Your question is a little vague, because you don't specify what you mean by heat. I think you are asking if something can get hot without you seeing it get red or some other color, so I will give and answer to that question.

When the temperature of a material increases, the internal energy of the molecules goes up, that means that if you could see the tiny atoms they would be oscillating fast... the "hotter" they are the faster they oscillate.

Now.. from electromagnetic theory, any oscillating charged particle would radiate. So, every time something is heated up, you have electromagnetic emission.

All light is electromagnetic emission, but not all electromagnetic emission is light. For example, X-rays are electromagnetic waves, but we cannot see them. Now you would ask, what do we call light then? Well, Light is one section of the electromagnetic spectrum (there are many different categories of electromagnetic radiation: radiowaves, x-rays, etc.). Which section? The one humans can detect with the eye. The human eye is a wonderful organ, but still is not capable of detecting everything. So, physicists define light as the part of the electromagnetic spectrum humans can see.

The type of the electromagnetic radiation coming from the material depends on how fast the charged particles (electrons) are oscillating.

Now, going back to the heat and light question... in some cases, the frequency of oscillation is not high enough for humans to see it, then there is no light... but there are electromagnetic waves coming out of the material (we just can't see them with our eyes, there are, however, special machines made by humans that allow us to see it),there is also an increase in the temperature.

So, to sum up, there could be an increase in temperature without visible light, but that doesnt mean there is no eletromagnetic radiation.

Hope that answers your question.

Answer 2

Light Without Heat

Answer 3

See the definition. The term heat is meaningless in the absence of matter. There is no heat associated with an electromagnetic wave (visible or not) traveling through a vacuum.

Any object at a temperature above absolute zero contains some thermal energy. Some of that energy will be radiated as electromagnetic radiation unless it is surrounded by a perfect reflector. It needs to be quite hot (several hundred degrees F) for that to fall within the visible spectrum. So, you can have heat without light only if you confine it, or if you consider only visible light.

Answer 4

There is no possibility of having heat without light. The Stefan Boltzmann law makes this quite clear. However, a light wave traveling freely through the universe has no heat associated with it.

Answer 5

IMO, the first answer was best, but I though I'd throw this in too...

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"Many chemical reactions produce both light and heat. A burning candle is such a reaction. When a candle is lit, its flame both glows and becomes hot. It is much less common for a chemical reaction to produce light without heat. The light from such reactions is called cool light, because it is created without heat. Reactions that produce light without heat are called chemiluminescent reactions. Perhaps the most familiar chemiluminescent reactions are those that occur in living organisms. Fireflies produce light without heat by a chemiluminescent reaction. Chemiluminescent reactions that occur in living organisms are called bioluminescent reactions."

http://scifun.chem.wisc.edu/HOMEEXPTS/Chemilum.html

Answer 6

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The claim assumes life in its present form is a given; it applies not to life but to life only as we know it. The same outcome results if life is fine-tuned to the cosmos. We do not know what fundamental conditions would rule out any possibility of any life. For all we know, there might be intelligent beings in another universe arguing that if fundamental constants were only slightly different, then the absence of free quarks and the extreme weakness of gravity would make life impossible. Indeed, many examples of fine-tuning are evidence that life is fine-tuned to the cosmos, not vice versa. This is exactly what evolution proposes. If the universe is fine-tuned for life, why is life such an extremely rare part of it? Many fine-tuning claims are based on numbers being the "same order of magnitude," but this phrase gets stretched beyond its original meaning to buttress design arguments; sometimes numbers more than one-thousandfold different are called the same order of magnitude (Klee 2002). How fine is "fine" anyway? That question can only be answered by a human judgment call, which reduces or removes objective value from the anthropic principle argument. The fine-tuning claim is weakened by the fact that some physical constants are dependent on others, so the anthropic principle may rest on only a very few initial conditions that are really fundamental (Kane et al. 2000). It is further weakened by the fact that different initial conditions sometimes lead to essentially the same outcomes, as with the initial mass of stars and their formation of heavy metals (Nakamura et al. 1997), or that the tuning may not be very fine, as with the resonance window for helium fusion within the sun (Livio et al. 1989). For all we know, a universe substantially different from ours may be improbable or even impossible. If part of the universe were not suitable for life, we would not be here to think about it. There is nothing to rule out the possibility of multiple universes, most of which would be unsuitable for life. We happen to find ourselves in one where life is conveniently possible because we cannot very well be anywhere else. Intelligent design is not a logical conclusion of fine tuning. Fine tuning says nothing about motives or methods, which is how design is defined. (The scarcity of life and multi-billion-year delay in it appearing argue against life being a motive.) Fine-tuning, if it exists, may result from other causes, as yet unknown, or for no reason at all (Drange 2000). In fact, the anthropic principle is an argument against an omnipotent creator. If God can do anything, he could create life in a universe whose conditions do not allow for it.

Answer 7

No...
any heat gives off Infrared radiation...that in itself is light just because you don't see it doesn't mean its not there...
Kelvin scale is a thermodynamic (absolute) temperature and is based on how much Infrared (Light) you get at temp...
so sorry no you don't have heat without light

Answer 8

Heat without light? Just rub two bodies against each other and they will heat without light.

Light without heat? It happens only when light travels thrue a non disipative medium - which is rather theortical. What about producing that light without heat? I have no knowledge about a totally cold light-producing.

Answer 9

Well, yes, two different states. Radioactive material gives off heat when it decays yet there is no light. A pile of leaves or grass clippings gives off heat, and again no light. Anerobic bacteria working in a septic tank give off heat, no light in there... When I ask my wife for sex she gets all mad, throws a rat-fit and gives off heat, definitely no light there, and as a matter of fact in gets really dark then.

Answer 10

Heat without light: Rub your hands together. Feel the heat? See any light?

Look up "Mechanical Equivalent of Heat" in Wikipedia
http://en.wikipedia.org/wiki/Mechanical_equivalent_of_heat

Light without heat: Get a glow-in-the-dark sticker or toy. Expose to light for a few minutes. Take into a dark room. See the light? Touch the sticker/toy. Feel any heat?

Look up "Photoluminescence" in Wikipedia
http://en.wikipedia.org/wiki/Photoluminescence