How much is a litre??

[benupton]

Hi there,
Okay I understand that it is 1 litre of volume. I am thinking of getting one litre of epoxy resin, In cm is this 10cm x 10cm x 10cm? I think it is but am after a second opinion.
Regards Ben

[Tankstand]

Hi Ben,

You are spot on! 1L = 1000cc which fits into a 100mm cube!

1000 of them = 1 cubic metre which = 1000L

[Avery]

Hi Ben,

You are spot on! 1L = 1000cc which fits into a 100mm cube!

1000 of them = 1 cubic metre which = 1000L

and of course, if it were water, 1L would weigh 1 kilogram. Or more correctly, it would have a mass of 1 Kg.

Aint the metric system wonderful...

[BobL]

and of course, if it were water, 1L would weigh 1 kilogram. Or more correctly, it would have a mass of 1 Kg.

Aint the metric system wonderful...

Unfortunately it's not that srtaightforward.

The Mass of 1L of liquid water depends on the temperature.
At 0º it's 999.85 g
At 4º it's 999.97 g
At 100º it's only 958 g

Then of course there's ice and steam which are also water

[STAR]

Oh. Dear.

Bob has put his hat on once again.

Pete

[Sturdee]

Unfortunately it's not that srtaightforward.

The weight of 1L of liquid water depends on the temperature.
At 0º it weighs 999.85 g
At 4º it weighs 999.97 g
At 100º it only weighs 958 g

Then of course there's ice and steam which are also water

And of course it should be measured at sea level as any increase in the atmospheric pressure also affects it.


Peter.

[BobL]

And of course it should be measured at sea level as any increase in the atmospheric pressure also affects it.


Peter.

The most atmospheric pressure can effect the weight of 1L of water is about 0.1% (this is a buoyancy effect).
Changes in weight due to altitude because of a changes in "g" are about 0.3% at 30,000 ft
Changes in weight due to latitude (equator to poles) is also about 0.3%

Note I also changed my post to "mass". Then none of the above matter.

[Avery]

Good on you Bob!

All correct.

Thank you.

I must learn to be more concise.
I must learn to be more concise.

[BobL]

Sorry if I came over as a smart #### - just too used to correcting students.

[danny.s]

Good work folks - love it. But I'm confused. I drive off the mountain from my home in the Dandenongs to buy my milk. As I bring it home I increase altitude and decrease temperature. Is my milk lighter or heavier when i get it home?

[Sir Stinkalot]

Good work folks - love it. But I'm confused. I drive off the mountain from my home in the Dandenongs to buy my milk. As I bring it home I increase altitude and decrease temperature. Is my milk lighter or heavier when i get it home?

How did you get home after driving off a mountain?

[BobL]

Good work folks - love it. But I'm confused. I drive off the mountain from my home in the Dandenongs to buy my milk. As I bring it home I increase altitude and decrease temperature. Is my milk lighter or heavier when i get it home?

Because it is presumably in an enclosed container the temp has no effect on the weight - the increase in altitude will degrease the weight. Mass stays the same

[danny.s]

Excellent work Bob! I will enjoy explaining this to my kids next time we go shopping.

[Avery]

Good work folks - love it. But I'm confused. I drive off the mountain from my home in the Dandenongs to buy my milk. As I bring it home I increase altitude and decrease temperature. Is my milk lighter or heavier when i get it home?

Do you buy milk or do you buy "lite" milk?

You should be careful. It would seem that some milks are getting "liter" if you believe the advertising. You may find that by the time you get home, depending on the time of year, your milk may have disappeared completely. A terrible thing!

I blame the physics. or was that the phsychics --- bugger!

[Master Splinter]

Ah, but the question is should we exclude or correct for the effects of frame dragging and other relativistic mass effects in our milk purchase calculations?