Our body has heat . We decay when we die. Stones are cold and are their sizes are not affected by heat. Can you tell me objects which don't expand with heat.
All materials have a non-zero thermal expansivity.
Some materials, at some temperatures (eg: zerodur: https://en.wikipedia.org/wiki/Zerodur)
have small expansion coefficients over limited temperature ranges, but none have no expansivity.
Here are examples for materials that show a temperature anomaly.
https://phys.org/news/2011-11-incredible-material-reveal-scandium-trifluoride.html
https://phys.org/news/2015-10-scandium-trifluoride-volume-changing-materials.html
https://physicstoday.scitation.org/do/10.1063/PT.5.0210168/full/
https://www.impactlab.com/2002/09/26/weird-heat-shrinking-material-discovered/
https://news.softpedia.com/news/Revolutionary-New-Material-Expands-to-Colossal-Lengths-78295.shtml
https://physicsworld.com/a/new-conductor-stands-the-heat/
https://www.wissenschaft.de/erde-umwelt/achtung-laeuft-bei-hitze-ein/
https://physicsworld.com/a/law-breaking-liquid-defies-the-rules/
Regards,
Joachim
Most obvious is ice. When heated (melted), it gets water that is DENSER rather than expands. Just this anomaly is a reason for Ice to float.
As well as for our skates to slip because the COMPRESSED Ice must transform into a lubricating water layer.
Expansion is of different types and forms: linear, volume, area, etc. I think the question should be directed at objects that expand when the temperature is low and shrink when the temperature is high. This is so because, objects tend to expand under high temperature
No i mean expansion in terms of volume or area. Yes objects expand at high temperatures.
Materials that don't expand (i.e. that shrink or remain the same volume) when heated are being developed for various purposes:
https://www.newscientist.com/article/2110340-material-that-shrinks-in-heat-can-weather-extreme-temperatures/
Chuck A Arize Chuck, may I chime in with Mr Adakawa?
All ices, whether made of water, or other small-ish molecules, have non-zero temperature expansion coefficients.
Indeed, all material objects have such a property - the question might be rephrased as, "What materials have a very small thermal expansivity coefficient?"
In which case, the reply to that would be, "At what temperature?"
At room temperature, zerodur(R) is a rather nicely stable glass, and Invar is a rather stoic metal with respect to its expansion or contraction.
Thermal Expansion and Contraction. Materials expand or contract when subjected to changes in temperature. Most materials expand when they are heated, and contract when they are cooled.
Rumani Dey Rumani, negative thermal expansion materials include zirconium tungstate. Its unusual crystal structure slowly contracts (shrinks) when heated from absolute zero (-273°C) to over 770°C.
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