Page 25 - Pressure 10 class

Upthrust(Buoyancy)

❑ The resultant upward force acting on an object when partially or wholly immersed in a
liquid is called upthurst or buoyancy.

❑ Formula to calculate Upthurst:

i.Upthurst = Weight of object in air – Weight

of object in liquid

ii. Upthurst ( U) = Volume of liquid(v) x

density of liquid(d) x Adg(g)

i.e (U) = v d g

This shows that,

i. Upthurst is directly proportional to volume of liquid(Uα v)
ii. Upthurst is directly proportional to density of liquid.(U α d)

iii. Upthurst is directly proportional to adg. ( U α g)

❑ Factors Affecting Upthurst;

i. Volume of liquid(v) ii. Density of liquid(d)

iii. Acceleration due to gravity ( g)

July 30, 2020 Taranath Baral/GC Shiba/Suraj Thapaliya 25