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guides:hydrogen_vs_helium_fro_hab [2018/02/26 14:39] – [Helium:] rocketboyguides:hydrogen_vs_helium_fro_hab [2018/02/26 14:41] (current) – [Helium:] rocketboy
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 Pure Helium has a density of 0.1786Kg/cu m however balloon grade helium is usually only 97% Helium – giving it a density of 0.2094Kg/cu m.  Air has a density of 1.225Kg/cum – giving: Pure Helium has a density of 0.1786Kg/cu m however balloon grade helium is usually only 97% Helium – giving it a density of 0.2094Kg/cu m.  Air has a density of 1.225Kg/cum – giving:
   * **97% Helium** a lift of about 1.01Kg/cu m   * **97% Helium** a lift of about 1.01Kg/cu m
-  * **Hydrogen** a lift of about 1.13Kg/cu m – so about **12% better than Helium**.+  * **Hydrogen** a lift of about 1.13Kg/cu m – so about **12% better**.
  
 === Altitude difference. === === Altitude difference. ===
  
-In practice the difference between Helium and Hydrogen is much less in terms of altitude attained. For example a 1Kg payload on a HY-1000 balloon at 5m/sec ascent rate would typically achieve around 32.0Km (105,000ft) on 97%Helium and 33.1Km (108,000ft) on Hydrogen – so **only 3% better.** +In practice the difference between Helium and Hydrogen is much less in terms of altitude attained. For example a 1Kg payload on a HY-1000 balloon at 5m/sec ascent rate would typically achieve around 32.0Km (105,000ft) on 97%Helium and 33.1Km (108,000ft) on Hydrogen – so only **3% better.** 
  
 === Difference in price: === === Difference in price: ===
guides/hydrogen_vs_helium_fro_hab.1519655992.txt.gz · Last modified: 2018/02/26 14:39 by rocketboy

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