A half bottle because small bodies cool down faster. Like a emporer penguin chick out in the open. The chick would freeze to death quick, that's why they try to say with their parents. Or why you cant blow on a whole bowl of hot soup to cool it down.
The water on the tray will evaporate faster - more exposed surface.
the lighter balloons go quicker than darker ones, but why?
Add more gelatine or use metal ramekins. Put them I'n the fridge and when you need to use them they will be cold meaning they would set quicker.
Assuming that it is a half litre bottle of water, the water would have a mass of 500g so the bottle would have a mass of 95g. However it might be a pint bottle of water, in which case the water would have a mass of 568g, leaving the bottle with a mass of 27g.
Tap water.
The water inside the bottle would freeze.
we would run out of water quicker
Rainbows form in the sky, therefore the water would not have to be in "the bottle."
The 16.9 is probably ounces, if it were cups it would be a very big water bottle.
The absorption of heat is higher.
In the first place the water in the bottle would keep the temperature of the plastic down preventing it from burning and leaking, The same as you would do by boiling water over a flame in a paper cup, However the water in the bottle would heat up and eventually the pressure inside the bottle would burst it like a balloon.
An unopened water bottle contains a small pocket of air, allowing it to float. If the water bottle were to have this air removed, its buoyancy would be determined by the purity of the water inside and outside of the plastic.