Orders of magnitude (specific energy density)

This is a table of specific energy densities by magnitude. Unless otherwise noted, these values assume standard ambient temperature and pressure.

**List of orders of magnitude for specific energy density**
Order of magnitude J/(kg)	Specific energy density	Storage method
10²	2.8	Day Laborer (for that day)
10²	4	Heel-Strike Generator Using Electrostrictive Polymers
10³	17	Protein (contains about 4 nutritional calories per gram)
	17	Carbohydrates (contains about 4 nutritional calories per gram)
	29	Alcohol (contains about 7 nutritional calories per gram)
	38	Fat (contains about 9 nutritional calories per gram)
10⁴
10⁵	2.16	NiMH rechargeable batteries
	6.12	Lead acid car batteries
	6.3	Li-ion watch batteries
10⁶	16	wood fuel
	25	ethanol
	44 [1]	Petrol (gasoline)
	120	Hydrogen

See also