State the reason why it is not correct quote the weight of solid objects in kilograms ​

Which is not a characteristic of a heat pump? a. it is used in air conditioners. b. it uses a refrigerant. c. it requires no work. d. it reverses the normal flow of thermal energy.

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)

The photo above shows oil and vinegar in a pitcher. the top make a claim about about the density of the vinegar compared to the density of the oil summarize the evidence to support the claim and explain your reasoning