cross-posted from: https://discuss.online/post/47437499

http://www.smbc-comics.com/comic/xxl

::: spoiler Alt text
I haven't dated in a long time, so this may be unrealistic.
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::: spoiler Bonus panel

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Wild

Should've been "do you have protection?" or something for the last line I feel like.

I feel like "I wanna do it" as her last line would have been a little funnier.

Icarus origin story

Up (NSFW)

So... hear me out. Yes i know its just a comic... im just autistic. Soooo...

Assuming the guy is average weight (70 kg) the total force of gravity on him is F~g~=70×g N. The force of boyancy would be F~boyancy~=d~helium~×V~displacemwnt~×g N.

If thease are in equilibrium (the guy floats):
F~boyancy~=F~g~

d~helium~×V~displacemwnt~×g =70×g

If d~helium~ is 0.178 kg/m^3^ then
70/0.178 = V~displacemwnt~= 393.5 m^3^≈ 1.9 m^3^ per condom.

Like i know condoms are super strechy (can hold about 40L air befor burating) but wow. Thats like a phone booth per condom.

Did you need this info?... no. Was i compelled to calculate this? ... no .... stay in school kids.

What if he used Hydrogen though

Hardly matters as the salient amount is the weight of the displaced air, not the weight of the helium or hydrogen. However using hydrogen might lead to a nice flameout.

Classic rookie mistake.

Not every store has an unlimited supply of condoms, especially the extra large ones*.

He brought 200 at her store, and emptied the shelves. He probably hit a dozen places and brought all they had on hand.

*I shall modestly refrain from enumerating the many, many times I myself have needed to purchase a vast number of extra large condoms...

I'm sorry to say this, but your autism has failed you. Buoyancy is proportional not to the mass inside the displaced volume, but to the displaced mass, which is to say the difference between the mass inside the displaced volume and the mass of the medium that would've otherwise occupied it. In this case that means Fbuoyancy=g(dair-dhelium)Vdisplacement. The density of air is about 1.23kg/m³, so your answer six times too big.

You are an ignorant child.

There was a NSFW version of 'Up' long before the animated one.

You're welcome.

https://youtu.be/Pkn1bVOE8H8

No, what matters is the comparative density, and you must calculate the total mass of the air displaced, as well as the mass of the gas being used to displace it. Hydrogen is half as dense as helium. While helium has a density of 4g/22.4L, air has an approximate density (assuming 3% water content) of about 29g/22.4L, by my calculations. So, helium is just under 1/7th the density of air, but hydrogen is less than 1/14th the density of air. Is it a tiny mass difference? Actually, no, it's quite significant. Hold for calculations.