Thermal Properties of Matter PPT Physics Class 11

 Page 1


PHYSICS – Thermal Properties of Matter
Page 2


PHYSICS – Thermal Properties of Matter
Introduction
You might have noticed that you feel hotter on a sunny afternoon as 
compared to a windy night. This is because of the difference in 
temperatures. Temperature is very high in the afternoon as 
compared to night.
Page 3


PHYSICS – Thermal Properties of Matter
Introduction
You might have noticed that you feel hotter on a sunny afternoon as 
compared to a windy night. This is because of the difference in 
temperatures. Temperature is very high in the afternoon as 
compared to night.
Temperature and Heat
Kinetic theory – particles are constantly 
moving and have kinetic energy.  The higher 
the temperature, the faster they move, so the 
more kinetic energy they contain.
Higher 
temperature
Lower  
temperature
Energy
Energy will flow from a hotter object to a 
colder one.  Particles in the hot object will 
lose kinetic energy, whereas particles in the 
cold object will gain energy.
Energy will continue to flow until both 
objects reach the same temperature.   
Objects at the same temperature will have 
the same average kinetic energy per particle.
Page 4


PHYSICS – Thermal Properties of Matter
Introduction
You might have noticed that you feel hotter on a sunny afternoon as 
compared to a windy night. This is because of the difference in 
temperatures. Temperature is very high in the afternoon as 
compared to night.
Temperature and Heat
Kinetic theory – particles are constantly 
moving and have kinetic energy.  The higher 
the temperature, the faster they move, so the 
more kinetic energy they contain.
Higher 
temperature
Lower  
temperature
Energy
Energy will flow from a hotter object to a 
colder one.  Particles in the hot object will 
lose kinetic energy, whereas particles in the 
cold object will gain energy.
Energy will continue to flow until both 
objects reach the same temperature.   
Objects at the same temperature will have 
the same average kinetic energy per particle.
Temperature and Heat
Are temperature and 
heat the same?
No, because a 
spoonful of boiling 
water (100
o
C) will have 
less thermal (heat) 
energy ….
… than a beaker of 
boiling water (at the 
same temperature).
Page 5


PHYSICS – Thermal Properties of Matter
Introduction
You might have noticed that you feel hotter on a sunny afternoon as 
compared to a windy night. This is because of the difference in 
temperatures. Temperature is very high in the afternoon as 
compared to night.
Temperature and Heat
Kinetic theory – particles are constantly 
moving and have kinetic energy.  The higher 
the temperature, the faster they move, so the 
more kinetic energy they contain.
Higher 
temperature
Lower  
temperature
Energy
Energy will flow from a hotter object to a 
colder one.  Particles in the hot object will 
lose kinetic energy, whereas particles in the 
cold object will gain energy.
Energy will continue to flow until both 
objects reach the same temperature.   
Objects at the same temperature will have 
the same average kinetic energy per particle.
Temperature and Heat
Are temperature and 
heat the same?
No, because a 
spoonful of boiling 
water (100
o
C) will have 
less thermal (heat) 
energy ….
… than a beaker of 
boiling water (at the 
same temperature).
Temperature
Heat
It is defined as the measurement of degree of hotness or coldness of a body.
For Example: A cup of hotsoup or a scoop of icecream
It is a form of energy transferred between two (or more) systems or 
system and its surroundings by virtue of temperature difference.
For Example: A cup of hot coffee can be considered as object or system 
and anything apart from hot coffee is surroundings. Then the heat will 
flow from one object to another as there is difference in temperature.