What can scientists measure to provide evidence that electrons can move from one energy level to another?
the energy absorbed or released by atoms
the number of electrons deflected by a thin sheet of gold foil
the angle of deflection of alpha particles

in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.

the body's situation won't change the forces are equal opposit and on the same body