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Exercise 1.        Maker

Explorers travel by a gas balloon. Before he sets off, he has filled a helium gas which has volume 400 cubic metre and a mass of 65 kg. While a gas balloon is flying, how many density is the gas balloon occupied?

Solution 1. We get V = 400 cubic metre, m = 65 kg. 2. We want to know the the density [Rho (ρ)] 3. We pop up the formula ; ρ = m/v Then ρ = 65 kg.

While a gas balloon is flying, the density of the gas balloon is 0.16 kg/cube meter. Ans.    ρ=0.16 kg./cube meter

Remark

1. Answer is possible. Why? Because the "ρ" of the weather is average 1.2 kg./cube meter. If the gas balloon is flown, it must have the density ("ρ") lower than the density ("ρ") average of the weather. 2.Noted that aluminum has a lower density compared to other metals, therefore airplane is made of aluminum. In addition, Aerogel is the world's least dense solid.