Dumb question, A thermos flask keeps things either hot or cold becuase the liquid inside is trapped within a vacume, we all know that heat cant pass through a vacuum. Space is a vacuum How does heat from the sun reach earth?
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ANSWERS: 6
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Unlike heat that is atomic motion, the sun lets off light and radiation which are particles. Those particles carry the energy to earth, hence the difference.
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There are three methods of heat transfer: 1. Conduction, in which a material in contact with a heat source, such as metal, allows the heat energy to flow from an area of high heat to low heat. This is how a metal soup spoon would heat up at the handle, for example, as the bowl of the spoon is placed in hot soup. 2. Convection, in which particles of matter that have been warmed by a heat source move to other places. This is the way that smoke from a fireplace heats a chimney, for example, or the way water pipes are heated as hot water flows through them. 3. Radiation, by which electromagnetic waves carry the energy through media (such as air, or the vacuum of space) which may not be appreciably warmed itself, until the waves are interrupted by another object that absorbs the heat energy.
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All I know is that my thermos keeps hot things hot and cold things cold but every time I put 3 cups of coffee and a popsicle in it, there are issues at break time.
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A Thermos doesn't actually hold the liquid itself inside a vacuum. What you find in a thermos is a glass envelope holding a vacuum. The liquid is actually contained in the glass envelope. Radiation is the primary way that heat travels in space.
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5-25-2017 Magnets.
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This reminds me of the Cajun guy deep in the delta who looked at a thermos for the first time and said "Wass dat?" He was told it was a thermos and that it keeps hot things hot and cold things cold to which he replied, "How do it know"?
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