If we look up in to the night sky and observe which stars appear to be the brightest. What are we actually observing?

A. Distance from the Earth

B. Apparent magnitude

C. Absolute brightness

D. Luminosity

Initially, the balloon had 3.0 liters of gas at a pressure of 400 kpa and was at a temperature of 294 k. if the balloon is cooled to 277 k and its volume decreased to 1 l, what will the new pressure in the balloon be?

Select the word from the list that best fits the definition the nuclear family into which a person is born or adopted.

The biosphere of the earth is made up of what compound? organic or inorganic?