EVAPORATION
Surface phenomenon i.e. only takes place in surface “Is change of liquid into vapour”. Evaporation has cooling effect. Takes place at all temperatures.
FUSION or MELTING
Change of a solid to liquid state at a fixed temperature on absorbing heat.
FUSION or FREEZING
Change liquid into solid state on cooling at a fixed temperature.
MELITING
Change of solid in liquid at fixed temperature on heating.
DEPOSITION
The change of vapour directly into solid on cooling.
SUBLIMATION
Change of solid directly into vapours on absorbing heat.
FORCE OF ADHESION
The force of attraction between the molecules of two different substance is called “FORCE OF COHESION” i.e. between glue and paper.
FORCE OF COHESION
The inter-molecular force of attraction between the the molecules of the same substance called “FORCE OF COHESION.” i.e. water and water.
Tips of driving to save petrol and diesel by The Petroleum Conservation Research Association.
,The Petroleum Conservation Research Association (PCRA) advises people how to save petrol/diesel while driving. Their tips are :- l drive at a constant and moderate speed as far as possible, switch off the engine at traffic lights or at a place where you have to wait, ensure correct tyre pressure ensure regular maintenance of the …
What is Natural gas ?
Natural gas is a very important fossil Fuel because it is easy to transport through pipes. Natural gas is stored under high pressure as compressed natural gas (CNG). CNG is used for power generation. It is now being used as a fuel for transport vehicles because Nit is less polluting. It is a cleaner fuel. …