Right on partner
IR Guns
- Sunny Boy
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Ice water can be warmer than 32F - the water is not freezing. Just as water turns into ice it should be 32 F.
And when it starts to get a "rolling boil", it should be 212F. My IR gun reads that boiling temp true every time.
Paul
And when it starts to get a "rolling boil", it should be 212F. My IR gun reads that boiling temp true every time.
Paul
- joeq
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You mean Franky in the calibration lab lied to me!?
(We have dry ice in work, and it's rated at 109° below zero. So I guess varying ices (?) could have different temps too. Maybe he had the refrigerator in work set at 32.
- BunkerdCaddis
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A mixture of ice and water will always be 32F, it is in it's phase change where it requires the transfer of heat energy to accomplish that. Yes, you can have water at 32F and ice at 32F it takes as much energy to go thru the phase change as it does to change one degree (if I am remembering my jr high science correctly). The phase change of water to steam is the same way. You can have water at 212F and steam at 212F (excluding pressurized vessels)
- Sunny Boy
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Under the right conditions in a lab.BunkerdCaddis wrote: ↑Thu. Dec. 02, 2021 10:57 pmA mixture of ice and water will always be 32F, it is in it's phase change where it requires the transfer of heat energy to accomplish that. Yes, you can have water at 32F and ice at 32F it takes as much energy to go thru the phase change as it does to change one degree (if I am remembering my jr high science correctly). The phase change of water to steam is the same way. You can have water at 212F and steam at 212F (excluding pressurized vessels)
For the rest of us in our kitchens trying to test an IR gun, water will be warmer unless the air temp is also near freezing point. The water picks up room heat.
Ask yourself which happens,.... set a bowl of ice cubes and water on your kitchen counter and see is the water freezes because of the ice in it being cold, or the ice melts because of the water being warmer ?
Paul
- Lightning
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The reason this works is because it takes a huge amount of energy to turn 32 degree ice into 32 degree water. To raise the temperature 1 degree of one pound of ice only takes 1 BTU. But to change that same pound of water from ice to liquid requires 144 BTUs. So the ice water settles at the freezing point every time.
Same happens turning water to steam. The transition takes a whopping 970 BTUs per pound.
Same happens turning water to steam. The transition takes a whopping 970 BTUs per pound.
- BunkerdCaddis
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Yeah what Lee said. When I worked in a Burger King (in a previous life) that's how we calibrated the test thermometers. Unlike fauci science this happens to be real science...