A control volume is: （ ）
A: An isolated system
B: A closed system but heat and work can cross the boundary
C: A specific amount of mass in space
D: A fixed region in space where mass, heat and work can cross the boundary of that region
A: An isolated system
B: A closed system but heat and work can cross the boundary
C: A specific amount of mass in space
D: A fixed region in space where mass, heat and work can cross the boundary of that region
举一反三
- The control volume is（ ） A: A system of a certain mass B: Space body with changed position and shape C: Fixed space body D: Space body with constant shape and moving position
- We can raise the temperature of a system by adding heat, but we can’t raise its temperature by doing work on it.
- We can raise the temperature of a system by adding heat, but we can also raise its temperature by doing work on it.
- In a constant volume process for a closed system, the internal energy change of the system depends on the heat exchanged.
- Which of the following descriptions is correct? A: The microscopic viewpoint studies the large-scale properties of matter (temperature, pressure, volume, etc.). B: The part of the universe under study in thermodynamics is called the system; the parts of the universe that can interact with the system are called surroundings. C: For an open system, only matter can be transferred between system and surroundings. D: A closed system must be an isolated system, but an isolated system may not be a closed system.