If you want portable power, meaning a compact, light source of power, you want a system that has high power density. Find the power systems with the largest possible power per unit area, W/m2 , and...

If you want portable power, meaning a compact, light source of power, you want a system that has high power density. Find the power systems with the largest possible power per unit area, W/m2 , and power per unit weight, W/kg. These quantities are just the reciprocals of the Area and Material intensities, multiplied by 1,000 to convert kW to W. Make a chart with these axes and identify the most promising power system.