What are these smooth distinct layers most directly evidence of?

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?

What is an aquifer for science class