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Old 01-05-2019, 04:51 AM   #11
maximara
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Default Re: [Magic] A Pound Takes Up 2 Cubic FEET?!

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What is the volume of a pound of air at , say , sea level ?
1 cubic foot of air = 0.0807 lbs. So 12.5 cubic feet.
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Old 01-05-2019, 05:11 AM   #12
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Default Re: [Magic] A Pound Takes Up 2 Cubic FEET?!

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Originally Posted by Mr Frost View Post
What is the volume of a pound of air at , say , sea level ?
Air is about 1/800 the density of water, and water is 62.5 pounds per cubic foot, or 0.016 cubic feet per pound; that makes air about 12.8 cubic feet per pound.
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Old 01-05-2019, 08:57 AM   #13
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Default Re: [Magic] A Pound Takes Up 2 Cubic FEET?!

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Originally Posted by evileeyore View Post
Yes. You have two limits, one of size and one of weight, stay within both when trying to stuff it full.
Best explanation here.

If the material being stored is above a certain density, weight (mass) is the limit. Below that density, volume is the limit. Different items (material) have different densities.
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Old 01-05-2019, 09:15 AM   #14
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Default Re: [Magic] A Pound Takes Up 2 Cubic FEET?!

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If the material being stored is above a certain density, weight (mass) is the limit. Below that density, volume is the limit. Different items (material) have different densities.
So what material has a density of less than 0.01 of water where we should worry about volume more than weight?
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Old 01-05-2019, 09:21 AM   #15
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Default Re: [Magic] A Pound Takes Up 2 Cubic FEET?!

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So what material has a density of less than 0.01 of water where we should worry about volume more than weight?
Any number of things that aren't simply solid spheres. Shape matters, too. Not everything is compact, flexible, and efficiently packed. A chair inside a bag does not have the density of wood.

It's often useful to have a capacity in terms of volume as well as weight.
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Old 01-05-2019, 10:36 AM   #16
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Default Re: [Magic] A Pound Takes Up 2 Cubic FEET?!

A 40-foot ladder that can't be collapsed?
A cloud of toxic gas?
A 2-foot-wide hollow glass sphere?
Aerogel?
Feathers?
An extremely large and fragile magical origami?
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Old 01-05-2019, 12:13 PM   #17
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Default Re: [Magic] A Pound Takes Up 2 Cubic FEET?!

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Originally Posted by Anaraxes View Post
It's often useful to have a capacity in terms of volume as well as weight.
Exactly. While it won't come up often in a DF/regular Fantasy game, I've had it come up a few times in a Technomancer game... the aforementioned "smuggling helium"... granted it was magical helium, which made it worth it, but the PCs were far more worried about volume than weight on the Hideaway air tanks.
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Old 01-05-2019, 04:24 PM   #18
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Default Re: [Magic] A Pound Takes Up 2 Cubic FEET?!

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Originally Posted by evileeyore View Post
Exactly. While it won't come up often in a DF/regular Fantasy game, I've had it come up a few times in a Technomancer game... the aforementioned "smuggling helium"... granted it was magical helium, which made it worth it, but the PCs were far more worried about volume than weight on the Hideaway air tanks.
You were doing it wrong then. Given the way the spell works what they should have been worrying about was the helium escaping the tanks unless they where designed to contain helium, in which case the problem would again be weight not volume.
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Old 01-05-2019, 06:23 PM   #19
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Default Re: [Magic] A Pound Takes Up 2 Cubic FEET?!

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You were doing it wrong then. Given the way the spell works what they should have been worrying about was the helium escaping the tanks unless they where designed to contain helium, in which case the problem would again be weight not volume.
LOL. The idea that magic isn't involved and changing things in some way.
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Old 01-05-2019, 07:08 PM   #20
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Default Re: [Magic] A Pound Takes Up 2 Cubic FEET?!

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LOL. The idea that magic isn't involved and changing things in some way.
Hideaway, and Magic in general, doesn't work like that, especially when your dealing with a gas. It doesn't turn the whole thing into an inter-dimensional pocket, it adds one (To the bottom from what the text implies, but there is no hard and fast rule). So when you pump a gas into the container it will spread out across the entire combined space and while the gas might not be able to leak out of the inter-dimensional pocket unless the rest of the container is designed to contain it it will leak out of that, unless you take pains to confine the gas to only the inter-dimensional pocket.

Additionally I'm pretty sure that helium is normally stored for transport under pressure and for magically-enhanced helium I see no reason why removing this property would be beneficial. So what your PC's should have done is had their pockets enchanted with Hideaway and had the mouths of the inter-dimensional pocket fitted with helium proof tanking apparatus and simply carried the stuff out in their pockets!
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