Science (Cycles)

[Angellina]

Why the mass of the cold water increases and decreases when you place a cover over the container of cold water?

[TonyV]

More homework? something to do with barometric pressure at a guess?

[bhg481]

It sounds like you've given us half a question as I can't understand what you are looking for.

[woofgang]

its magic!

[Bert45]

Which is it? Does the 'mass' (don't you mean 'weight'?) increase or decrease when you put a cover over it? It can't do both. Does the cover come into contact with the container, or is it just held above the container? If so, how far above?

[JimF]

Are you talking about the anomalous expansion of water?

[THECORBYLOON]

Is it about increase in density of water as it drops to 4°C and reduces as the temperature drops?

[douglas9401]

Angellina, they don't know.

[woofgang]

douglas I do....Its magic!

[fiction-factory]

The density of water changes as the temperature changes but I thought this meant the volume changes rather than the mass.
But as douglas says, we don't know the answer. I'm not sure we understand the exact question either.

[gumboot]

Sounds to me as if it's something to do with the tides but I'm no expert!

[fiction-factory]

Shame jim or theprof never saw this one

[Bert45]

I wish that Angellina would come back and explain the question a bit better. But, while we're waiting, I'd like to ask Angellina who says that the mass of the cold water increases and decreases when you place a cover over the container of cold water? If it were anything to do with atmospheric pressure, you wouldn't need to put a cover over the container.