Calculate the volume of helium gas sample that has a mass of 1.2 g at room conditions

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

What term is missing from the central region that describes hypotheses, theories, and laws? popular predictable mathematical falsifiable