Question

what is the relation between density of liquid and it's up thrust?​

Answer 1

Explanation:

density is one factor affecting upthrust (buoyant force). if the density of the substance is more than the density of the fluid, then the upthrust will be less and thus the substance sink. if the density of the substance is less than the density of the fluid, then the upthrust will be more and thus the substance float.

Answer 2

Answer:

The weight of liquid displaced is the weight of the liquid that has been replaced by the object. The volume of this amount of liquid is equal to the volume of the object itself. The weight of fluid displaced and therefore the upthrust will be bigger if the density of the liquid is large. The upthrust in salty water (relative density = 1.1) is larger than that in water (relative density = 1.0) for the same object. This is why it is easier to swim in the sea than in a freshwater lake.

Archimedes principle says that when an object is immersed in a liquid the apparent loss of weight of an object is equal to the upthrust and this is also equal to the weight of the liquid displaced. You can prove this by the following experiments.

Weigh an object in air and then lower it into a beaker of water that is resting on a top pan balance. The reading on the spring balance will get less while the reading on the top pan balance will increase by the same amount.

If you already know the density of the liquid then you can simply measure the volume of displaced water and use mass = volume x density to find its mass. This can easily be done using a measuring cylinder as shown in the diagram.

You can see how the apparent weight of the stone gets less when it is immersed in water. If it was only partly immersed it would appear to weigh less than in air but not as little as when it is totally immersed in the water.

A set of helium balloons fixed to a thin nylon thread makes an eye-catching display in a local car showroom. It is an excellent example of upthrust in a gas. What is the equation and name for the shape of the curve? Explain your answer.