Biology College

Select all that apply.

The displacement method for measuring volume:

is not always accurate
can only be used to measure the volume of solids
may yield incorrect results if the matter is soluble in liquid
is the most precise way to measure the volume of a gas

Answers

Answer 1
The following statements are correct about the displacement method:
1. It can only be used to measure the volume of solids.
2. It may yield incorrect result if the matter is soluble in liquid.
The displacement method is usually used to measure the volume of solids, especially irregular solids. It involves dropping the solid in water and measuring the volume of water that is displaced. The result may be affected if the solid is soluble in water.
Answer 2

The right answers are: B. and C.


This measurement technique is based on Archimedes' principle :

Any body immersed in a fluid at rest, fully wetted by it or crossing its free surface, undergoes a vertical force, directed from below upwards and opposite to the weight of the fluid volume displaced; this force is called Archimedean thrust.

For the theorem to apply, the submerged fluid and the immersed body must be at rest. It must also be possible to replace the immersed body with submerged fluid without breaking the balance, the counterexample being the stopper of a bathtub filled with water: if it is replaced by water it is clear that the tub is empty and that the fluid is no longer at rest. The theorem does not apply since we are in a case where the cap is not completely wet by the liquid and does not cross its free surface.

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