{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Microsoft PowerPoint - Introduction To Heat and temperature

# Microsoft PowerPoint - Introduction To Heat and temperature...

This preview shows pages 1–7. Sign up to view the full content.

INTRODUCTION TO HEAT AND TEMPARATURE Course By : Prof. Course By : Prof. Mohajer Mohajer prepared by: S.M. S.M. rafigh rafigh 2011

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Difference of Heat & temperature Heat is energy it can do work. Temperature is a man-made, arbitrary scale indicating which direction heat is flowing…is heat going into the system, temperature rising or is heat leaving the system, temperature declining. Heat is measured with an instrument called a calorimeter. Heat is NOT measured with a thermometer. Temperature is measured with a thermometer. Heat is measured in Joules. Temperature is measured in degrees.
There are 3 thermometers which measure temperature. Recall that a thermometer is a man made scale simply indicating the direction of heat flow. It is also a relative measure of the motion of molecules in the system. If the molecules are moving fast with lots of KE then the temperature is high because a lot of heat is in the system. If the temperature is low then we may assume there’s not as much heat in the system and we can expect the molecules to be moving slower with less KE…generally less energy in the system.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Gabriel Fahrenheit and Anders Celsius In the briefest terms, Fahrenheit took a glass tube and graduated it…made marks, 1,2,3 etc. He used water as the standard. We often do use water as our standard for things, it is cheap and plentiful and easy to get. He froze some water and the mercury in the tube dropped to the mark he had made…32 degrees. When water boiled the mercury in the tube rose to 212 degrees. That is the thermometric scale we use in the USA.
Anders Celsius When Celsius investigated the subject of temperature he did something a little differently. He did not mark off the glass tube. He simply put it into frozen water and where the mercury landed he called that 0 degrees. When water was boiling and the mercury rose and leveled off he called that 100 degrees. This is the one use most around the world. Although in science we use a third thermometer when dealing with extreme temperatures.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Lord Kelvin Kelvin was interested in a more philosophical approach to the behavior of matter at different temperatures. He wondered, for example, what would happen if there was a condition of NO HEAT. At “absolute” zero what would the conditions be? At zero Kelvin, at absolute zero, all motion would cease since temperature is an indirect measure of the motion of molecules. So if there was no heat there would be no motion and thus no temperature. But a condition of absolute zero cannot exist since there is no absolute NO motion. Everything moves relative to SOME frame of reference. So EVERYTHING has SOME temperature. Atoms vibrate. Electrons revolve around the nucleus of every atom.
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 21

Microsoft PowerPoint - Introduction To Heat and temperature...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online