QUESTION TIME

They're interchangeable. They featured on a once - common brand of heavy truck.......(owned by several members of this forum)

Jarrod.

Q45.78
This is for those that have a scientific / analytical mind
If I was to get 2 lots of 1000 litres of water and freeze one of these which would be the heavier the liquid form or the frozen and reasoning why???? :dry:

Q45.78

RE: If I was to get lots of water

Nevr evr gunna happen

coz U dun drink water

well OK brewed water

:lol:

cya

§

The water.

Ice floats so water is obviously heavier.

Both the ice and water weigh the same. Generally speaking, when water freezes onto ice, it expands and takes up a larger volume for the same weight, making it less dense than water, which is why ice floats in water.

I think mass is measured per cubic cc, inch or whatever regardless of solid, liquid or gas. Litres is just a volume measurement that only happens to coincide with a kilogram of water at a particular temperature. Density is how weight measured.

The 1000 litres of water weighs 1000kg and occupies a container of 1 cubic metre. As you freeze it the ice decreases in density and expands to spill out of the box (exploding stubbies in the freezer). If you trim it to fit the original box you now have the same cubic metre but it weighs less so ice weighs less than water. At 4 degrees it actually becomes denser (weighs more per cubic metre) than when it is either hotter or colder.

If you heat it from 4 degrees it becomes less dense and lighter (hot water on top of the pool, cold at the bottom). If you go past 100 degrees it turns to gas - still the same water but a long way between molecules and fewer of them taking up the same volume with far less weight.


Lang

(exploding stubbies in the freezer).
Lang[/quote]


Bugger...

Mass is a measurement of volume. This is why a ships tonnage is the volume of it's hold. The weight of the ship is its displacement.

Not quite right. A ships displacement is the weight of the water it displaces. It obviously has a fixed initial displacement for the weight of the ship itself empty.
If we had some giant scales we could see the empty ship weighed X tons and if we weighed the water that could fill the hole the ship made it would also weigh X tons.

You can say displacement is equal to hold volume ONLY if you fill it up with water (weight inside is displacing an equal weight outside as it sinks down).
Looking good so far.


Unfortunately this comes unstuck if you fill it up with steel as the ship will have displaced twice as much water with only half full holds and will have sunk before they are fully loaded. Or you fill it up with foam mattresses and the hold will be full with the ship sitting up well above her lines displacing a quarter of the water it did when carrying steel.

Archimedes' principle states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces and acts in the upward direction at the center of mass of the displaced fluid.

Maximum displacement of a vessel is set at the depth it can sink/load it can carry while still remaining stable when it is designed with variations for fresh/salt/warm/cold water. You can see these various lines marked on the hull of a ship.

A ping pong ball and a golf ball have about the same VOLUME but different mass/weight. Put them in a bucket of water and see what happens re displacement.

Lang

With DD on this. The question stated 2 lots of 1000 litres of water, no mention of a fixed volume so the frozen 1000 litres is still 1000 litres but the volume has changed due to freezing. Thaw it out and you will still have 1000 litres of water.