Helium

Some back-of-the-napkin calculations for lifting shit in a helium balloon.

Physics

 * Helium density is 178.5 g/m^3
 * Air density is 1275 g/m^3 (in "usual" conditions)

~163g Helium is required to lift 1Kg of payload

Equipment
2M helium balloons (0.18mm PVC) For 1M radius, volume is (4/3)*pi*r^3 ~= 4.2 m^3 at full inflation.

Helium supply varies, but prices are around 500ILS/4m^3 helium. Need to make sure Helium is not diluted, as lift calculations can be affected.