Please write a paragraph (5 sentence minimum) that describes convection in Earth's atmosphere. Please include the following vocabulary terms; warm, cold, more dense, less dense, rise, sink, high pressure, low pressure, fair, stormy and wind/breezes.

(This is a Science question so I clicked the subject that was closest, please help!)

An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?