Asked by S.S
                Why is a blimp less dense than the surrounding in air? 
            
            
        Answers
                    Answered by
            DrBob222
            
    The blimp is filled with a gas less dense than air; i.e., usually helium. Hydrogen is even less dense than helium but there is a fire hazard with hydrogen. Read about the Hindenburg disaster if you want to follow up on that. 
    
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