Heat and Temperature PDF

Heat and temperature Supervisor Reza Fahad Hanon  heat Heat is the energy transferred from an object at a higher temperature to an object at a lower temperature. Temperature can be define as the measure of the average kinetic energy of the individua...

Heat and temperature Supervisor Reza Fahad Hanon  heat Heat is the energy transferred from an object at a higher temperature to an object at a lower temperature. Temperature can be define as the measure of the average kinetic energy of the individual particles in an object. T e m p e r a tu r e D e p e n d s o n P a r tic le M o v e m e n t  Temperature scales : Celsius is the temperature scale used mostly in other countries and in science. Based on 0 C being freezing point and 100 C being boiling point. Fahrenheit is a temperature scale used mostly in the United States. Kelvin scale is the temperature scale used by scientists, where all of the numbers are positive. ‫‪T e m p e r a tu r e c o n v e r s io n s‬‬ ‫ إنها سلسلة من االهتزازات أو التذبذبات التي تنتقل من‬ ‫نقطة إلى أخرى‪.‬‬ ‫ إنها تحمل الطاقة بدون نقل المادة‪.‬‬  Specific heat or specific heat capacit  The quantity of heat required to raise the temperature of 1 gram of a substance by one degree Celsius (or Kelvin).  called the specific heat capacity, or specific heat.  The unit of Specific heat is J/g(oC).  Specific heat law 𝑸 = 𝒎 𝒄 ∆𝑻. ‫ا‬  The amount of heat energy needed to raise the temperature of a a substance depend on: The amount of the material The specific heat of the material The change in temperature Mass in kg Temperature change in K Heat energy in J Specific heat capacity in J/K.kg Q / Equation for calculating heat energy  What is the specific heat of silver if the temperature of a 15.4 g sample of silver is increased from 20.0oC to 31.2oC when 40.5 J of heat is added? Givens: m = 15.4 g Q = m C ∆T 40.5=15.4(C)(31.2-20.0) Ti = 20.0oC 40.5=15.4(C)(11.2) o Tf = 31.2 C 40.5=172.48(C) ∆T = Tf - Ti o q = 40.5 J C = 0.235 J/g( C) What is the final temp of silver if the temperature of a 5.8 g sample of silver starts out at 30.0oC and 40.5 J of heat is added? The specific heat of silver is.235 J/g(oC).  What are the three types of heat transfer ? C o n v e c tio n : Heat is transferred as a Conduction : Heat is transferred in result of the difference in the volume mass of conduction from the molecules with the the fluid from one region to another due to the highest energy to the lowest energy. difference in temperature. Radiation : Heat flow through waves Or particles. T h a n k y o u a ll