Conceptual Design of a Small Hybrid Unmanned Aircraft System

Table 5

Lifting gas comparison.

Lifting gas	Density at sea level and 0°C	Lifting force of 1 m^3 of gas
Helium (He)	0.178 kg/m^3	11.8 N
Hydrogen (H)	0.090 kg/m^3	10.9 N
Air	1.292 kg/m^3	##