Why does a balloon filled with helium rise while a balloon filled with an equal volume of average atmospheric air does not? A. Helium has no mass, but air does.
B. Helium increases the balloon's mass more than air.
C. Helium has a higher density than air.
D. Helium has a lower density than air.
Answer- D

he . if i may ask what i your question exactly?

explanation:

hi,

what occurs during a solar eclipse?

there are small tides across earth.

the moon is between earth and the sun.

p.s. im not sure if the first answer is correct because during a solar ecliphse there are spring tides and i dont know if they are the same.

the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas

365.25 earth days are in the year of a light year