How Does A Vacuum Flask Work?

- Jul 14, 2020-

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    How Does a <a title="What is the vacuum flask?" href="https://en.wikipedia.org/wiki/Vacuum_flask" target="_blank">Vacuum flask</a> Work?<br style="box-sizing: border-box; outline: 0px;"/>Most vacuum flasks rely on double-wall or even triple-wall construction; each wall is separated by a vacuum.

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    Air is an effective medium through which heat can move. <br/>

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    Just think of the earth’s atmosphere. It stands to reason that if there’s less air between two objects (that are not touching)

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    then the gap between the two objects does a better job of resisting heat transfer. Simply stated: the less air, the less heat flow.

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    Insulated windows work the same way. You have two or three panes of glass joined in one sealed assembly,

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    and each pane of glass is separated not by air but an inert gas that is a poor conductor of heat.

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    Scottish physicist and chemist <a title="Who is James Dewar" href="https://en.wikipedia.org/wiki/James_Dewar" target="_blank">James Dewar</a> noticed this effect and invented the vacuum flask,

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    a container with an inside and outside wall separated by a vacuum. Dewar’s flask was the forerunner of today’s vacuum flasks.

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    The gap between the container’s inside and outside walls don’t have to be wide, it just needs to be absent of air to be effective.

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    Vacuum flasks Care And Use<br style="box-sizing: border-box; outline: 0px;"/>It’s simple to care for vacuum flasks. Try not to drop it or bang it around, which may break its vacuum seal. Keep it clean.

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    Most vacuum flasks are not dishwasher safe. Sometimes their lids are but the bottle may not be rated to withstand the thermal cycle of a dishwasher.

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    When in doubt, hand wash. While we won’t do a deep dive into thermodynamics here,

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    suffice it to say that a wide range of factors can influence the temperature of the liquid you keep in a vacuum flask.

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    To keep the contents hot or cold, reduce the temperature difference between the vacuum flasks and its surroundings.

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    To keep coffee hot on a winter day, keep the thermos in a pack surrounded by something that will insulate it, for example.

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    Or keep it in your car, especially if there’s the sun coming through its windows.

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    To keep the contents cold, but the vacuum bottles in the shade or in a cooler. Be mindful of where you set the vacuum flasks down.

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    For example, setting it on ice (say you’re ice fishing) will increase the rate of heat flow from the vacuum flasks to its surroundings.

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    Your coffee or cocoa will cool off more quickly. Yes, a vacuum flask with an insulated lid

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    and a vacuum seal at its base resists heat loss or gain more than other designs,

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    but regardless of the design, with a little common sense,

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    you’ll reduce the rate at which the vacuum flasks reach temperature equilibrium with its surroundings.<br style="box-sizing: border-box; outline: 0px;"/>

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    How We Tested<br style="box-sizing: border-box; outline: 0px;"/>We put these <a title="GiNT Vacuum flask" href="https://www.gintstar.com/vacuum-flask/stainless-steel-thermos-coffee-travel-mug.html" target="_blank">vacuum flasks</a> to the test,

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    quantitatively, to see which will keep your hot drink hot for the longest amount of time,

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    and which will protect that nice chilled drink from heating up.

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    For More Information:

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    Tel: <a href="tel://+86-571-85865338">+86-571-85865338</a>

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    Email: <a href="mailto:kira@gint.cc">kira@gint.cc</a>

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