Life support

This is going to be looking at things from a combination of contemporary tech (and reasonable extensions thereof) and future tech based mainly on the Traveller RPG. It's probably easily adaptable to other backgrounds.

Humans need a few basic items. I'm going to list them in order of importance. That is, how quickly you'll be in trouble without them.

They are:
air
temperature
water
food
gravity

( Air )

( Temperature )

( Water & Food )

( Gravity )