science-chapter 6

-themal energy of am object increases as its temperature increases - heawt is the termal energy that flows

-conduction -convection -radiation

transfer of thermal energy by collisions betwwen particles in matter -requires matter

transfer of thermal energy in a fluid by the movement if warmer and cooler fluid from place to place-requires matter-ex:wind currents

transfer of energy by electromagnetic waves -doesn't require matter -energy from the sun

a material in which heat flows slowly

-air -R-value: highernumber better insulator

-does work to move heat from a cooler temperature to a warmer temperature -ex:refrigerator or air conditioner

-converts thermal energy into mechanical energy -ex: internal combustion, gas or diesal, external combustion

measure of the average kinetic energy of the particles in the object

-amount of heat that is needed to raise the temperature of 1kg of some material by 1 degree C - depends on matter and termal energy

high specific heat means it absorbs a lot of energy with little temperature change

change in termal energy=mass (kg) times change in temperature (degree C) times specific heat (J/kg) -Q=m(tf-ti)C

most common, fuel burned and heats a volume of air

use solar collectors that absord radiatn energy from the sun

materials inside a building absorb radiant energy from the sun

no central furnace

flow through pipes to radiators

fuel burned in a central furnace heats the water

-as a substance absorbs heat, the temperature change in the object depends on the nature of the substance -specific heat

-heat can change thermal energy -temperature is the measure of average kinetic energy of the particles in an object