Science Question - Argument with wife.

I pick
1.

No...
2

No..
1

Damn..

Succumb, the vacuum weighs less.

Torricelli is delighted.

Perhaps first you can enlighten us by telling us what a "vaccume" is. Are you asking about a vacuum?

Not so fast

Prove it.

Nothing would give me greater pleasure.

Are you asking about a vacuum?
errr....
yep one of them too Mr Sturgis

surely you jest
chocolate? sex? football? a red rose? there must be something.

Forget about the jar.

What weighs less, air or vacuum?

(My vacuum is very heavy and I hate carrying it up the stairs)

I am on the ropes but will go down kicking.

Torricelli gave the first scientific description of the cause of wind:
Was it? Ptttthhhh

Elucidate, varlet!!!

No, she's right. Air is heavier than vacuum, and a jar of something heavy weighs more than a jar of something light.

Weight is the measurement of a certain mass within a certain gravity field, right? If the weight of the jar is the same and the gravity field is the same, the object with less overall mass will weigh less.

The jar itself weighs the same no matter what's in it, though. You could salvage a technical victory.

Cycloptichorn

Which would weigh more, a jar of air or a jar of Helium?

We routinely use the weight of gasses to measure how much of something is in a container. If you grill using propane, you probably noticed there is a scale on the tank to tell you when it is empty. Commercial gas in cylinders are sold the same way.

Measured weight = Effect of gravity - Buoyant effect from air

The buoyant effect in air is only dependent on the volume of the container, so it is the same if the container has air or is at a vacuum. The effect of gravity depends on what is in the jar, so if there is air it there, it will be heavier than if there isn't.

U r advocating the proposition that: AIR HAS NO WEIGHT;
that the MATTER of nitrogen and of oxygen has no weight; i.e., that according to u,
gravity does not pull down on that matter, for some reason.

I have a hunch that u know better than that.





David

And a jar is not "full of" vacuum. A jar maintains a vacuum inside of it. By definition, a vacuum is empty; it cannot fill anything.

Air is heavier than vacuum. It doesn't have anything to do with air pressure outside the jar, it has to do with the lack of molecules inside the jar. Air has molecules in it, vacuum doesn't. Molecules have mass and therefore weight.

My vacuum is a dyson It weighs more than Air.

If i had a large jar with a vacuum in it. Tt would weigh more than a jar with air in it.

/thread

I think you just answered your own question.

Indeed, a glass with air in it is heavier than a glass with a vacuum in it. You fooled yourself with the phrase "full of vacuum", which really translates to "full of nothing". A glass with a perfect vacuum has absolutely nothing in it. By contrast, a glass without a vacuum has as many air molecules in it as the surrounding atmosphere does. It is therefore that much heavier---about a gram for a one-liter glass at normal atmospheric pressure.

EDIT: If you must take the surrounding atmosphere into account---and you don't---perhaps you can get the right intuition by thinking of air bubbles in water. Do they rise or do they sink? Same with vacuum in air. The only difference is that the air in your example plays the role of the water in mine, and that your vacuum plays the role of my air.

Are you asking about Buoyancy, or Weight, or Mass?