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Post by Bob on Jul 21, 2022 10:09:11 GMT -5
My Chinese wife returned from China a few days ago. Last night, she was using what is called a jade facial roller on her face. She rolled it a little bit on mine and I jumped from the cold temperature of the jade! I asked if she kept it in the refrigerator. She said no, it was just laying around in the bedroom. I rushed into the living room, got those pieces of jade from the polish comparison test, touched them to my face, and couldn't believe it. They were also cold. This made no sense at all to me. Then I started grabbing various polished rocks here and there of other types, and all of them were cold! I could not tell by my hands, but if touched to the face, or to the side of my neck, or to the inside of my elbow, it was obvious.
Has anyone else ever noticed this strange thing?
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Jul 21, 2022 11:49:57 GMT -5
BobThat’s funny Bob my husband and I were just talking about this the other day when I finished a batch of petrified wood. He was saying how strange it is that they are so cold. Don’t know the science behind it but it’s pretty cool! (Literally lol!)
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electrocutus
spending too much on rocks
Member since October 2020
Posts: 331
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Post by electrocutus on Jul 21, 2022 12:12:57 GMT -5
Metal is like that too. Put the back of a spoon on your neck to see. I don't know the science of it either, but it's interesting how quickly the rock absorbs your body heat and warms up.
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Post by Son Of Beach on Jul 21, 2022 14:15:45 GMT -5
I always figured it was a mixture of how much energy the rock or item at hand can hold on how sensitive or how many nerve endings are in the area of touch. Rocks are very dense and have essentially absorbed the conditions around them (even room air temperature) and the molecules and structure are packed tight, not easily giving up their "energy". Grab a room temp blanket or plastic item and it will change more in tune with your body heat because it's not as dense and the structure is much more spaced out than something like a rock or a dense piece of metal. Maybe our hands are more calloused or don't have the same nerve endings as say the low of your back or wrist, etc. Your body is much warmer than most everything it comes in contact with. I'm spitballing here, for what its worth
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rockbrain
Cave Dweller
Member since January 2022
Posts: 2,539
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Post by rockbrain on Jul 21, 2022 14:47:40 GMT -5
I always figured it was a mixture of how much energy the rock or item at hand can hold on how sensitive or how many nerve endings are in the area of touch. Rocks are very dense and have essentially absorbed the conditions around them (even room air temperature) and the molecules and structure are packed tight, not easily giving up their "energy". Grab a room temp blanket or plastic item and it will change more in tune with your body heat because it's not as dense and the structure is much more spaced out than something like a rock or a dense piece of metal. Maybe our hands are more calloused or don't have the same nerve endings as say the low of your back or wrist, etc. Your body is much warmer than most everything it comes in contact with. I'm spitballing here, for what its worth Might be spitballing but I think you've got it right.
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Post by HankRocks on Jul 21, 2022 15:02:11 GMT -5
Just did a little test. My garage is at 94F today. Took a couple of the large tumble polished rocks and vib lap polished pieces that were in the garage and they were not cool to the touch as they had warmed to the ambient temp in the garage. Same in the house, they were cooler but the ambient temp is around 76F. any smooth surface should take on the ambient temp it is exposed to.
There is apparently one exception that someone out here on the forum had mentioned one day. I have several larger cut pieces of Jade, or one of it's cousins, not polished. In the garage there is a definite coolness to the flat cut surface of those Jade(?) pieces. It was mentioned that was a characteristic of Jade, always seems cool to the touch regardless of the ambient temp.
A reverse example occurred during the Great Blizzard of 21, record cold and snow and ice and below freezing for continuous 34 hours(hey it's Houston!!). Several buckets of Brazilian and other agates got very cold, probably freezing in their buckets. Two or 3 days later the temp warmed into the mid 70's and high humidity. Those rocks and the concrete floor sweated for a couple of days until the their temp normalized.
Henry
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Post by Bob on Jul 21, 2022 16:41:55 GMT -5
...our hands are more calloused or don't have the same nerve endings as say the low of your back or wrist, etc. Your body is much warmer than most everything it comes in contact with.... Well, I too think you have nailed it. No magic here at all. I was just too dumb to realize that my body is almost 97 degrees inside, so probably not a whole lot less than that on the skin. My house is more or less about 76, because we don't keep it that cool. I suppose about anything in the house that I pressed against my face, except for my dog, might also have felt cool. Now that I think about it, I feel silly for being surprised by it. Indeed I have calloused hands too with thick skin from being outdoorsy and also the type of gymnastic exercise I do with bars overhead and barbell work.
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Post by hummingbirdstones on Jul 21, 2022 21:20:29 GMT -5
Found this on a search:
https://www.reddit.com/r/explainlikeimfive/comments/emnrmv/comment/fdsaah5/
So you don't have to click through:
DoctorWatchamacallit
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3 yr. ago
a common misconception about heat and temperature is that temperature is interchangeable with heat. In actuality, heat is the transfer of energy and when you feel a cool object, what you're feeling is heat transfer into the object. How much you feel is a property dependent on the heat conductivity of the material, not the actual temperature of the objects in question. When I taught introductory physics, we used to do an experiment with students where we took equal temperature ice cubes and put one on a metal slab and one on a block of wood. the ice melted on the metal much faster than the one on the wood despite both being at room temperature because metallic objects conduct heat easier than wood, and this is consequently why it feels cooler to touch than wood. This is also the reason why when stirring a pot of hot soup, you'd be smart to use a wooden spoon rather than a metal one, as the metal one would conduct heat easier and be likely to burn your hand. So the short answer is that rocks like Jade just conduct heat better than others.
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Post by Bob on Jul 21, 2022 23:21:11 GMT -5
Thanks! I'm in a bathtub as I read this, reached over, touched the wood door then the metal doorknob. It's exactly as you stated. Nothing was felt for the wood, but the doorknob was cool.
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Post by parfive on Jul 22, 2022 0:45:32 GMT -5
Conductors and insulators.
Also apply to electricity, sound and common sense. : )
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Post by vegasjames on Jul 22, 2022 7:45:36 GMT -5
With diamonds it is high thermal conductivity. This is why they are nicknamed "ice" since they feel cold to the touch due to high thermal conductivity. Same way diamond testing devices detect diamond. They are measuring the thermal conductivity of the stone.
I would assume jade has a high thermal conductivity as well, which would explain their use in infrared rollers in massage beds, etc.
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Wooferhound
Cave Dweller
Lortone QT66 and 3A
Member since December 2016
Posts: 1,423
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Post by Wooferhound on Jul 22, 2022 18:39:44 GMT -5
Which rock are best ones to Air Condition the house ?
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Post by vegasjames on Jul 22, 2022 19:02:46 GMT -5
Which rock are best ones to Air Condition the house ? Glacier ice.
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Post by Rockoonz on Jul 24, 2022 1:15:31 GMT -5
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Post by Bob on Jul 28, 2022 22:31:11 GMT -5
I go by that store every May on way to Isle Royale. Will check it out thanks!
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