Differences

This shows you the differences between two versions of the page.

--- guides:hydrogen_vs_helium_fro_hab [2018/02/26 14:38] – [Helium:] rocketboy
+++ guides:hydrogen_vs_helium_fro_hab [2018/02/26 14:41] (current) – [Helium:] rocketboy
@@ Line 15: / Line 15: @@
 === Difference in lift: ===
 Hydrogen has a density of about 0.0899Kg/cu m (at 1 atm 15C).
-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
+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:
-Air has a density of 1.225Kg/cum – giving:
   * **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. ===
-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: ===