Pressure and Flotation Flashcards
What is pressure?
Force per unit area?
What is hydrostatic pressure?
Pressure due to a liquid.
What is absolute pressure?
The sum of the atmospheric pressure and hydrostatic pressure.
What is a hydrometer and what can it be used for?
It is an instrument used to gauge the density of a liquid based on how high the hydrometer floats in it (higher = higher density)
It is used to check for fraud in alcoholic drinks or testing dairy products.
What does Archimedes’ principle state?
When an object is partially/totally immersed in a fluid, it experiences an upthrust (N) that is equal to the weight (N) of water it displaces.
How would you demonstrate Archimedes’ principle?
Use a spring balance and a rock and an overflow can, with a waste beaker.
Fill the can up to the brim before overflowing out, then record the upthrust the stone experiences when it is in the overflow can held by a spring balance.
Find the weight of the water it displaced (minus the weight of the beaker). They should equal.
State the Law of Flotation.
This law states that when an object is floating, the weight of the floating object will equal the weight of the fluid it displaced.
What is the density of a substance?
Its’ mass per unit volume (kg m^-3)
