Microsoft PowerPoint - Introduction To Heat and temperature

Microsoft PowerPoint - Introduction To Heat and temperature...

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

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: INTRODUCTION TO INTRODUCTION TO HEAT AND TEMPARATURE HEAT AND TEMPARATURE Course By : Prof. Course By : Prof. Mohajer Mohajer prepared by: S.M. prepared by: S.M. rafigh rafigh 2011 2011 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. 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 get. 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 lled that egrees. When water was boiling and 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. 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 ere was no heat there would be no motion and thus no temperature. there was no heat there would be no motion and thus no temperature....
View Full Document

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 Right Arrow Icon
Ask a homework question - tutors are online