Figure 3. (Color online) Calculated specific energy and density of the van-der-Waals model of air at K = 3.42. 1, isothermal compression work (PA = 1bar) vs final pressure PC (left axis). 2, fuel density measured in g/cm3(right axis)

From

Linde-Hampson Anti-Machine: Self-heated Compressed Van-Der-Waals Gas as an Energy Carrier for Pneumatic Vehicles

E.Ya. Glushko

American Journal of Energy Research. 2013, 1(3), 59-67 doi:10.12691/ajer-1-3-4