Astronaut and chemist Dr. Don Pettit does physics demos that are out of this world (literally: he is on board the International Space Station). Dr. Pettit presents physics that can only be demonstrated in micro-gravity.
Credit: Science off the Sphere
Challenge Question: Why can't you use a regular cup in
microgravity?
Challenge Answer: Using a regular
glass, water particles are attracted to the bottom, and sides of the cup. A
small disturbance, such as taking a sip, would cause the liquid to separate
from the glass. If the surface tension did not hold the water together, water
would float around everywhere. With the "Space-Cup", the liquid will stay
attached to the edges, and capillary action will keep the water connected when
taking a drink.
Source:
- Bistronauts, Physics Central, February 17, 2012
