Wondering about how heat from light will travel

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SUMMARY

This discussion centers on the thermal properties of dark versus clear materials in terms of heat absorption and transfer. It establishes that dark materials, such as black metal and dark glass, absorb more heat than their lighter counterparts. When comparing two glass jars—one dark and one clear—filled with water and containing black metal pieces, the clear jar allows for greater heat absorption by the metal, leading to a higher temperature increase in the water. The conversation also touches on the implications for building and vehicle cooling, emphasizing that tinted glass can be more effective in reducing heat accumulation.

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  • Familiarity with materials science, specifically regarding glass and metal
  • Basic principles of thermodynamics
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Thundagere
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Let's say you take two metal objects, one black and one white. Out in the sun, the black will reach higher temperature in a given period of time.

Now, let's say I take two glass jars. One is of DARK glass (like, an apple cider or wine bottle), and one is clear. In the clear one, I place several black pieces of metal, in the dark one, nothing. Then, I place something like water inside both containers.
Which given amount of water will reach a higher temperature? The dark bottle will clearly absorb more than the clear one, but some of that heat will travel to the water. The rest will travel to the surrounding air. On the other hand, if one takes the clear container, the metal objects will absorb a large amount of heat and heat the water, and less will be dispersed to the atmosphere. Which method supplies the most heat to the water?
 
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Thundagere said:
Let's say you take two metal objects, one black and one white. Out in the sun, the black will reach higher temperature in a given period of time.

Now, let's say I take two glass jars. One is of DARK glass (like, an apple cider or wine bottle), and one is clear. In the clear one, I place several black pieces of metal, in the dark one, nothing. Then, I place something like water inside both containers.
Which given amount of water will reach a higher temperature? The dark bottle will clearly absorb more than the clear one, but some of that heat will travel to the water. The rest will travel to the surrounding air. On the other hand, if one takes the clear container, the metal objects will absorb a large amount of heat and heat the water, and less will be dispersed to the atmosphere. Which method supplies the most heat to the water?
If you want to keep a building or car cool, do you put in clear glass or tinted glass?

In the case of tinted glass, where does the bulk of the energy from the sunlight accumulate?
In the case of clear glass, where does the bulk of the energy from the sunlight accumulate?
 
Last edited:
So the clear one would result in a greater temperature increase?

On the other hand, the jars provide a larger target than the inner receptacle.

But since the jars allow light straight through, does that make a difference? I mean, the light needs something to focus off of to disperse any relevant heat...
 
The clear glass/bottle would obiously collect a bit more heat, as DaveC426913 said do you put tinted or clear glass in your car? but other than that he provided your answer
 
Well ... actually it depends on the sizes of the black metal pieces. If they are too small then the dark jar will collect more heat and conduct into the water inside than the dark metal pieces will collect and conduct into the water in the clear jar.
 

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