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Element Mercury

Submitted by MonkeyLurker on 15 February 2005 - 1:37am.

What is the density of mercury?

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Submitted by Martin17 on 16 February 2005 - 6:31am.

13.546 at 293o K.

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allan_chemist's picture

Submitted by allan_chemist on 16 February 2005 - 8:14am.

Martin17 wrote:
13.546 at 293o K.

do you use °K every time you quote an absolute temperature, or do you just use it here to emphasise you are using a temperature?

Because you're *supposed* to just quote in K (no ° symbol) because it's the absolute temperature scale.

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Submitted by scarf on 16 February 2005 - 8:20pm.

my thermo and stat thermo professor was very adamant about using the degree sign on Kelvin (Big no-no). To the extent where he took off points on tests :!: especially after he spent 20 minutes in class explaining why it is incorrect. Luckily I picked it up when I got my first homework back :o

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allan_chemist's picture

Submitted by allan_chemist on 16 February 2005 - 10:09pm.

Worryingly, some lecturers here (a minority tbh) use °K

I cringe every time.

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Submitted by Martin17 on 17 February 2005 - 6:13am.

Just sloppiness :oops:

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feline1's picture

Submitted by feline1 on 2 March 2005 - 3:36pm.

Yeah but why use degrees with Farenehit and Centigrade (Celcius) then?

It's just by linguistic analogy...

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allan_chemist's picture

Submitted by allan_chemist on 2 March 2005 - 7:20pm.

Because Farenehit and Celcius (Centigrade) are degrees of an absolute scale.
This absolute scale is the Kelvin scale.

Just like angles are degrees of an absolute angle, 360°

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Submitted by scarf on 2 March 2005 - 7:51pm.

If I remember right, it is "quasi" correct to use the degree sign for a temperature differential even on the K scale. Since it quotes a temperature change, rather than an absolute temperature.

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pizza1512's picture

Submitted by pizza1512 on 8 March 2005 - 1:18pm.

allan_chemist wrote:
This absolute scale is the Kelvin scale.

Is it named after Kelvin...

Who is Kelvin?...

:?:

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allan_chemist's picture

Submitted by allan_chemist on 8 March 2005 - 4:08pm.

www.infoplease.com wrote:
Kelvin temperature scale, a temperature scale having an absolute zero below which temperatures do not exist. Absolute zero, or 0K, is the temperature at which molecular energy is a minimum, and it corresponds to a temperature of -273.15° on the Celsius temperature scale. The Kelvin degree is the same size as the Celsius degree; hence the two reference temperatures for Celsius, the freezing point of water (0°C), and the boiling point of water (100°C), correspond to 273.15K and 373.15K, respectively. When writing temperatures in the Kelvin scale, it is the convention to omit the degree symbol and merely use the letter K. The temperature scale is named after the British mathematician and physicist William Thomson Kelvin, who proposed it in 1848. Another absolute temperature scale, the Rankine temperature scale, is used by some engineers. See also Fahrenheit temperature scale

Yay for British people again!

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