TemperatureMr. Baldwin –AEC

September 13th, 2010

TemperatureMeasure of heat or how fast molecules are

moving

Faster molecular motion = more heat

Slower molecular motion = less heat

No such thing as cold, just lack of molecular motionTherefore – NO

HEAT!!!

ThermometersFahrenheit

Mainly used in the U.S. & Belize (Burma too!)

Based on ice, water, and salt (a brine) = 0 degrees

Freezing or melting of H2O = 32 degrees

Under the armpit of his wife = 96 degrees

180 degrees from water freezing to water boiling (212 )

o

ThermometersCelsius

Most widely used around the worldBased on behaviors of water

Water freezes at 0 Water boils at 100 Exactly 100 between 0 and 100

oo

o o

ThermometersKelvin

Favorite of scientistsAbsolute Zero

Such a lack of heat, that molecules actually STOP moving!!!

This doesn’t actually exist Deep Space just above 0 K (Big Bang!!!)

Exactly 273 added to the Celsius scale

Do the practice problems on the back of your note sheet!

Converting from Fahrenheit to Celsius

[°F] = [°C] × 9⁄5 + 32

Remember 180 F between boiling and melting and 100 C between boiling and melting

180/100 = ???

°°

Converting from Celsius to Kelvin

[°C] + 273 = KAbsolute Zero = -273 C°

Extra Credit ChanceThe Fahrenheit and Celsius scales have

exactly one point where the numbers of the scale overlap

(i.e. X degrees F = X degrees C)Either show me:

The math to prove where these two scales overlap, or

Find a reputable website (not Wikipedia) which tells you this data point. I will need a full citation for this

Baldwin, P. 2010. APIRA-chem. Accessed 12 September, 2010 at http://aspira-chem.wikispaces.com/.

Conversion Graphs

10 20 30 40 50 60 70Temperature (oC)

0

20

40

60

80

100

120

160

180

Tem

pera

ture

(o F

)

80 90 100

140

200

220

Use the conversion graph to convert

(a)76o C to oF

(b) 100oF to oC

Remember:

0oC = 32o F

100oC = 212o F

oC 0 60 100oF 32 140 212

Use the conversion table to draw a conversion graph between oC and oF.

Conversion Graphs

10 20 30 40 50 60 70Temperature (oC)

0

20

40

60

80

100

120

160

180

Tem

pera

ture

(o F

)

80 90 100

140

200

220

Use the conversion graph to convert

(a)76o C to oF

(b) 100oF to oC

Remember:

0oC = 32o F

100oC = 212o F

168oF

38oC

oC 0 60 100oF 32 140 212

Use the conversion table to draw a conversion graph between oC and oF.

Rankine Scale

Just like Kelvin scale

Only based on Fahrenheit scale- 491.67 R = Freezing Point H2O- 671.41 R = Boiling Point H2O