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Heat energy
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what is meant by heat energy ?
a form of energy that transfers from higher temprature to lower temprature
what happens if : there were no spaces between the railway bars
the iron will expand causing accidents
what happens when : two bodies with the same temprature touches each other
nothing happens , no heat transfers as they have the same temprature
GR : leaving spaces netween the railway bars
as iron is a good conductor of heat that expands upon heating , so leaving space is to avoid accidents
materials are divided into ------ heat conductors and ----- heat conductors
good and bad
heat is used in some industries as ----- and -=-----
glass industry and food industry
SF :a form of energy used in warming water and cooking
heat energy
TF : different metls transfer heat at the same rate
F
TF: handles of cooking pots are made of copper
F
GR : aluminium and stainless are important conductors
we use them in making cooking utensils
GR : the handle of the kettle is made of plastic
as plastic is heat insulator
TF : Aluminium condusts heat faster than iron
T
GR : when you hold a hot cup ,you feel hot
the heat transfers from the hot cup to my hands
GR: Heat is important in our daily life
we use it for warming cooking drying washed clothes glass industry food industryheating water
TF: Metals are bad conductors of heat
F
tf: AIR IS USED IN MANUFACTURING OF INSULATING GLASS
T
TF: Wood is good conductor of heAT
f
TF : Aluminium is bad conductor of heat
F
ST : materials that allows the heat flow through
HEat conductors
-------,------- and------ are good conductors of heat
copper aluminium mercury
we measure temprature by using ----------
thermometer


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