[AdamSelene235]

The liquid is much colder than nitrogen, about 20K, and it’s much less dense, a liter of LH2 weighs only 70 grams, where water weighs 1000 grams. It’s pretty flammable, naturally.

Yes, it has a nasty tendency to condense liquid oxygen which makes sparks.....

[DBrow]

“Yes, it has a nasty tendency to condense liquid oxygen”

lol I’ve taken a Coke can (if you prefer RC Cola go for it) and filled it with LN2, and set it on steel wool. Little drops of LOX form amid the frost and drip down. Light a match near the steel wool, and WHOOSH, pretty sparks! and a bright yellow-white flame.

Helium from a cryo transfer line condenses LOX too, except that you can make it solid as well, solid air, which with a little kerosene, um, never mind...

professional driver on a closed course, don’t try this at home.