Astronauts in a space shuttle can float while orbiting earth. why are these astronauts weightless?

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

1 the 4 is sig

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.