Is marble "cooler" than other stone?
nd...@sat.net
I've heard that marble's surface temperature is always cooler than other
stone. About 10 degrees F cooler .Is this for real? And has anyone else heard
something like this too?
Thanks for any help in clearing the air.
David
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Peter Ceresole
In article <6iqbh2$l8s$1...@nnrp1.dejanews.com>,
nd...@sat.net wrote:
>I've heard that marble's surface temperature is always cooler than other
>stone. About 10 degrees F cooler .Is this for real?
No, it certainly isn't.
Polished white marble standing in the sun would probably be cooler than a
lump of basalt but that's another story altogether; black marble would be
warmer too.
--
Peter
Ron Hunsinger
In article <B1769EB3...@cara.demon.co.uk>, pe...@cara.demon.co.uk
(Peter Ceresole) wrote:
> Polished white marble standing in the sun would probably be cooler than a
> lump of basalt but that's another story altogether; black marble would be
> warmer too.
To be precise, polished white marble heats up and cools down more slowly
than black marble (and probably black basalt also). That means it will be
cooler most of the day (when it is "standing in the sun"), but will will be
warmer most of the night.
-Ron Hunsinger
Peter Ceresole
In article <hnsngr-ya0231800...@news.sirius.com>,
hns...@sirius.com (Ron Hunsinger) wrote:
>To be precise, polished white marble heats up and cools down more slowly
>than black marble (and probably black basalt also). That means it will be
>cooler most of the day (when it is "standing in the sun"), but will will be
>warmer most of the night.
Correct up to a point. In general, both are losing heat by conduction into
the ground below, which has a large heat inertia and is cooler than the
temperature of either slab in the sun. That's not affected by colour. So
the white marble cools as fast as the black by conduction and on average
its temperature will be lower.
--
Peter
John Holmes
nd...@sat.net wrote in message <6iqbh2$l8s$1...@nnrp1.dejanews.com>...
>I've heard that marble's surface temperature is always cooler than
other
>stone. About 10 degrees F cooler .Is this for real? And has anyone else
heard
>something like this too?
Marble does _feel_ slightly colder to the touch than many other stones.
I think this is because of a higher thermal conductivity (and maybe
specific heat?), it conducts away the warmth from your finger. It
doesn't mean the stone is really any colder (if you measured its
temperature with a thermometer), though. Its like touching metal
compared to touching wood at the same temperature.
Regards,
John.
hol...@smart.net.au
email copies of any replies would be appreciated.
Sherilyn
In article <6isgpc$qaq$1...@perki.connect.com.au>, John Holmes
<hol...@smart.net.au> writes
>
>nd...@sat.net wrote in message <6iqbh2$l8s$1...@nnrp1.dejanews.com>...
>>I've heard that marble's surface temperature is always cooler than
>other
>>stone. About 10 degrees F cooler .Is this for real? And has anyone else
>heard
>>something like this too?
>
>
>Marble does _feel_ slightly colder to the touch than many other stones.
>I think this is because of a higher thermal conductivity (and maybe
>specific heat?), it conducts away the warmth from your finger. It
>doesn't mean the stone is really any colder (if you measured its
>temperature with a thermometer), though. Its like touching metal
>compared to touching wood at the same temperature.
There is a demonstration of this at the Launchpad (children's
exploration area) of the Science Museum in London (closest Underground
station: South Kensington). There are several panels, including wood,
marble and various kinds of metal, kept at room temperature with
thermometers attached. Touching one after another graphically
demonstrates the effect of different thermal conductivity on subjective
feelings of temperature.
--
Sherilyn
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