Hi guys,
My apology for the self-enforced rest from this blog. Well, because of H1N1 …some people pronounce it HINI!… Right, no use ranting and raving, now straight to the point.
Temperature Scale
A thermometer has two fixed points:
the fixed lower point ( ice point) is the temperature at which pure ice and water exist in thermal equilibrium at 1 atmosphere pressure. Its temperature is 273.15 K = 0 0C = 32 0F.
The fixed upper point (steam point) is the temperature of water when it exists in thermal equilibrium with steam at 1 atmosphere pressure. Its temperature is 373.15 K = 100 0C = 212 0F. (This is because for the Celcius scale, there are 100 equal divisions between 0 (ice point) to 100 (steam point), while for Fahrenheit scale, there are 180 equal divisions from 32 (ice point) to 212 (steam point).
In addition to these two , is the Triple Point of Temperature. At this triple point, matters exist in the form of solid, liquid and gas simultaneously. The triple point of water is 273.16 K or 0.01 0C.
Thermometers
I’ll describe 6 of them below:
*op = temperature operating range
1.Mercury thermometer = op – 39 0C to 357 0C
2.Constant Volume Gas Thermometer = -270 0C to 1500 0C
3.Thermocouple = -150 0C to 1150 0C
4.Resistance Thermometer = 180 0C to 1770 0C
5.Thermistor = -70 0C to 300 0C
6.Optical Pyrometer = ambient to almost 3000 0C
