Making astronaut ice cream in my home shop 

He looks like a good soul.

I was thinking the same thing!

I imagine it being similar to powder creamer, but crunchy. I used to love eating dry baby formula when I was a toddler. My cursed mother limited me, but otherwise I might have eaten the whole can. "It's yummy you guys" -E.Cartmen.

This is correct. Astronauts actually had normal ice cream as a treat, and not the freeze-dried kind.

Regardless of this fact, they typically sell astronaut ice cream at NASA visitor centers (the Wallops Island one had it the past few times I was there)

@@garrett2449 "NASA" visitor centers are not operated by NASA but by independent companies to provide entertainment

Pretty much all food taken into space is freeze dried. When every Lb of weight is costing $50,000 who want to remove as much weight as possible from your food.

mossdee that's a cool idea, OP PIN THIS MAN!

mossdee Actually, I believe it's 97% water.

I guess you would then need a much bigger cold trap.

No bigger than the amount of watermelon, luckily.

Your explanation of how increasingly concentrated sugar solutions lowers the freezing point made me think about the prickly pear cactus surviving freezing winters with this mechanism when other cacti cannot. "After 7 weeks [at cooler temperatures], relative water content decreased ... mucopolysaccharide content increased ... hygroscopic mucopolysaccharide acts as a passive water capacitor to reduce water efflux during extracellular freezing ...The ability of O. humifusa to tolerate extracellular freezing and cellular dehydration, together with the increases in mucopolysaccharide at low temperatures, may help explain its distribution in regions of North America that are subject to subzero temperatures for prolonged periods in the winter." Loik, M. E., & Nobel, P. S. (1991). Water relations and mucopolysaccharide increases for a winter hardy cactus during acclimation to subzero temperatures. Oecologia, 88(3), 340-346. doi:10.1007/bf00317576

+Isaac Levy No audio track. I wonder if he was panic-swearing or panic-squealing.

+Isaac Levy Yeah that's basically nightmare fuel. Every time I see his videos I half expect something to go very very very wrong.

I believe it overflowed because it wasn't that cold and that's why it evaporated the dry ice so quickly.

I'm gathering parts to make a freeze dryer, and I'm wondering how important the water trap is. Why not just let the water vapor go through the pump? The low pressure line could be heated to make sure the water did not freeze inside the pump when it reached 1 atm pressure.

@@machinemaker2248 Depending how much water needs to be removed, you might be able to use only the pump. It will accumulate water, so change the oil frequently. Use a large diameter hose between the chamber and pump (or trap) to give good conductance for the water vapor.

@@AppliedScience How good of you to reply to me on a 9 year old video. I very much appreciate it. Thank you for the guidance, too.

I guess he took this comment as a suggestion and freeze dried his own poop.

Any decent ice cream or popsicle should have at least a good part of dextrose along with the sucrose

***** Yup, just like what your described.

de0509 curry is actually an English invention based on popular Indian herbs and spices. Kind of a mish mash of various popular regional dishes, Order curry in India and they say "what?"

@@craigcooper8593 There's thousands of different types of curries here haha.

Using large-diameter tubing is important for good vapor flow at low pressures, but if you can't get below .2bar, you have a large leak, or a broken pump. Everything has some level of risk. The risk of the flask imploding is low enough to be tolerable in my opinion.

Applied Science gotcha, thanks so much!

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+Applied Science The vacuum probably doesn't have to be that strong, since it's just the partial pressure of water that has to be below the triple point, not the total pressure.

+Applied Science While you're probably right about the low risk of an imploding flask, it's still a good idea to use the correct tools for the job. There is a lot of glassware which is made specifically for use with vacuum systems. The flask linked below looks like it is intended to hold up against a vacuum (sorry, I didn't see a more appropriately sized flask): www.amazon.com/United-Scientific-FG5340-1000-Borosilicate-Tubulation/dp/B00ES3R29M/ref=pd_sbs_328_4?ie=UTF8&dpID=31Vko3olz0L&dpSrc=sims&preST=_AC_UL320_SR174%2C320_&refRID=1YG631GJP6E0E11KXP93 I majored in chemistry and I would get in trouble if I used a normal flask in a vacuum system. Thanks for another great video.