Aballoon filled with helium gas has an average density of

Average density is defined by following formula

here in order to find out the average density of helium we can fill a balloon of helium gas and then we can find it's volume and its mass.

The ratio of mass and volume of that balloon will help us to find the average density of helium

So by the above experiment the average density of helium is approx 0.179 kg/m^3.

wind moving at higher speeds will transfer more energy to the water, resulting in stronger waves.