Where do I know that name from?

H. P. Lovecrafts' Cthulhu Mythos.

Ahhh but of course.
How come you decided to do an anatomy picture?

I wanted to create a version of her which was a more-or-less workable organic being rather than an otherdimensional magical creature.

Intruiging.

meep? vas ist das?

cool

Cool! LOL

7500ton at air density (1.2754 kg/m3), that's over 7.5x10^7 cubic meters. That seems pretty damn big. As big as a crater early nuclear bombs created.

Don´t forget, much of it is hydrogen, which has a density 14 times less than air.

...no, I understand that you can get it to lift. But it needs to displace 7500tonnes of air, which is a huge size.

Wait... wait... (confused) does that mean her body volume has to be the same as that of the displaced air?

Yes, by definition she will displace a volume of air equal to the volume of her body (that is what displacement means). In order for her to float she must displace an amount of air equal in mass to her body, which means that she either needs to be much bigger or much lighter if you want her to be able to float using conventional physics. At standard temperature and pressure a cubic meter of hydrogen lifts just over 1.1 kilograms, so assuming that you used metric tons she will need 6.8 million cubic meters of hydrogen, I'd work out the volume of the appropriate sphere but its almost 4am and my brain is fried.

The radius of such a sphere would be about 118 meters. Call it 120 to be on the safe side and that sounds about all right.

She´ll have to be slightly bigger, then...

Actually her envelope will need to be over twice its current size (about 240m diameter), you're working out the radius not the diameter, its what kept tripping me up last night.

A quick sanity check is to work out the cube root of the volume and remember that a sphere will always be larger than a cube for the same volume. So as the cube root of 6.8 million (or 6,818,181 to be precise) is 189, therefore 118 can't be the right value for the diameter.

BTW I just found an online calculator for spheres http://www.rkm.com.au/CALCULATORS/C.....le-sphere.html and it gives a diameter of 235m

Ahhh...

Well.. it is enormous... but she is outrageous anyway. I´ll just have to alter some numbers

How can you tell it's a him or her?

Well, according to my original design sketches from a few years ago, most of her tentacles end in an orifice. Some are mouths.

So what if (say) Cthulhu decided to give ole Shubby there a punt? Would her hydrogen foam be expelled? Would she burst/pop?

Well, first of all, her epidermis is pretty tough. As you see, there are several layers of skin between her hydrogen bladder and her skin, including a layered skin complex consisting of "cross-woven" fibers. Then, there is a layer of spongy tissue which absorbs impact. The air-tight membrane which envelops the bladder is actually pretty thick, consisting partially of muscle tissue which can locally contract or expand to relieve tension or provide more resistance.
Finally, the hydrogen foam is surprisingly tough; her glands secrete bubbles made up of a slime which is so viscous it´s very hard to pop, especially once it´s `hardened´. Of course, the foam is lighter than air, but it would only escape if a very large tear was made in her dome - after all, it all sticks together.

If it should happen, she would not die; she would sag and slither around, like a giant octopus, as her wound would heal; once she´s airtight, she would slowly fill up with hydrogen again until she can take off once more.

I suppose I should have compartimentalized her hydrogen bladder. But neh.

Awesome, very well thought out. I guess she uses the hydrogen glands to extract hydrogen from the atmosphere and all!

From water, I think... she uses energy from photosynthesis to chemolyze water into hydrogen and oxygen.

That sir, is awesome.

The "interaction body" on the far side of the stomach intrigues me...

I'm still hoping to see you do some stuff with this guy err umm plant thing

I really should! She is my only venture into macro/vore stuff so far... and I didn't have to break any natural laws, either.