Archimedes was born in 287 BC at
Syracuse, Greece ,one of the most powerful
Greek city state. In Syracuse 212BC
Archimedes died, by being killed by a Roman
soldier who didn’t know who he was.
Archimedes had a father who’s name was
Phidias. It is believed Phidias could have been
related to Hieron the 2nd ,the king of Syracuse.
It is not known if Phidias was married or had
Archimedes Principle states that
when a body is immersed partially
or fully in a fluid, it experiences
an upward force that is equal to
the weight of the fluid displaced
BOUYANT FORCE or
WHEN A BODY IS
IMMERSED PARTIALLY OR
COMPLETELY INSIDE A
FLUID IT EXPERIENCES AN
UPWARD FORCE CALLED
THE BUOYANT FORCE
The Buoyant force acting on an
object depends upon two
The volume of the body
immersed i.e. volume of the
fluid displaced , or
density of the fluid
Take a Eureka can and fill it up to its spout. Take a
stone and suspend it with the hook of the spring
balance.Note the weight of stone in air.Let it be w1.
Now immerse the stone inside water in the Eureka
can. The water overflows through the can. Collect
this overflowing water in the beaker. Now, also note
the reading in the spring balance.Let it be w2.
This w2 will be less than w1 due to upthrust
provided by water. Apparent loss in weight due to
upthrust will be (w1-w2).
Measure the weight of water collected in the beaker
, which in fact is the weight of water displaced by the
On comparing we will find that the loss in weight
(w1-w2 ) is equal to the weight of the water
displaced by the stone. Hence , The Archimedes'
principle is verified.
Used in designing ships and submarines
Used in making Lactometers, which are used to
determine the purity of a sample of milk
Used in making Hydrometers , which are used for
determining density of liquids