8 Temperature conversion formulas Celsius to Fahrenheit: oF = (9/5 * oC) + 32oC 0FFahrenheit to Celsius: oC = (5/9) * (oF – 32)oF 0CCelsius to Kelvin: K = oC + 273oC KKelvin to Celsius: oC = K – 273K oC
9 Fill the missing blanks using the previous oFoCKWater boils100oBody Temperature37oRoom Temperature68oWater freezes0oAbsolute zero
10 What is absolute zero? The lowest temperature on Kelvin scale (zero Kelvin)At this temperature particles stop moving.
11 What is heat?Heat is the transfer of energy between two objects that are at different temperatures.When two objects of different temperature come in contact, energy is always transferred from the higher temperature to the lower temperature.
12 What is thermal energy?Thermal energy is the total energy of the particles that make up a substance. It is measured in Joules.Which one has more thermal energy?
13 What is thermal equilibrium? Energy is transferred from the higher temperature object t o the lower temperature object until both objects reach the same temperature.
14 What are conductors?Conductors are substances that conduct thermal energy.
15 What is an insulator?An insulator is a substance that does not conduct thermal energy .
18 Thermal conductivityThe rate at which a substance conducts thermal energy.
19 Specific heat capacity The amount of energy needed to change the temperature of one Kg of a substance by one degree Celsius.
20 Specific heat capacity of different materials: Silver234Copper387Glass837Wood176Steam2010Ice2090Aluminum899Water4184
21 Matter and heat States of matter Three states of matter: solid , liquid and gas.
22 heat technology Heat engines A machine that uses heat to do work. Heat engines burn fuel to produce thermal energy in a process called combustion.There are two types of heat engines: external combustion and internal combustion heat engines.
23 External combustion: fuel is burned outside the engine. Internal combustion: fuel is burned inside the engine.
24 Cooling systemCooling systems are used to transfer thermal energy out a particular area so that is feels cooler.Question:Will leaving the refrigerator door open on a hot day help to cool the kitchen?