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Some values:

• mass (total) 90 PJ/kg = 21 Mt TNT per kg
• nuclear fusion 300 TJ/kg = 70 kt TNT per kg
• nuclear fission U-235 90 TJ/kg = 22 kt TNT per kg
• hydrogen 120 MJ/kg
• gasoline 44 MJ/kg
• fat 38 MJ/kg
• coal 23 - 29 MJ/kg
• sugar 17 MJ/kg
• wood 15 MJ/kg
• TNT 4.2 MJ/kg (according to definion of the unit of energy)

For rocket fuel a more relevant quantity is the energy per unit mass including oxidizer. For example, to burn 1 kg of hydrogen, 8 kg of oxygenOxygen is the chemical element in the periodic table that has the symbol O and atomic number 8. The element is very common, found not only on Earth but throughout the universe. Molecular oxygen (O, often called free oxygen on Earth is thermodynamically un is needed, so that the high fuel value reduces to 13.3 MJ per kg propellant.

Also relevant is the density: since that is very low for liquid hydrogen, the energy per unit volume is not so high, hence a large and therefore heavy tank is needed.

For projectileA projectile is any object sent through the air by the application of some force. In a general sense, even a football or baseball may be considered a projectile, but in practical action most projectiles are designed as weapons. Motive force Arrows, darts,s, compare the value for TNT with the energy of a kinetic kill vehicle with a closing speed of e.g. 10 km/s, which is 50 MJ/kg.

Compare:

• specific heat of vaporizationThe heat of vaporization is a physical property of substances. It is defined as the heat required to vaporize one mole of a substance at its boiling point under standard pressure (101325 Pa). The heat of vaporization is expressed in kJ/mol. The use of kJ/
• specific heat capacityHeat capacity (abbreviated C or just C also called thermal capacity is the ability of matter to store heat. The heat capacity of a certain amount of matter is the quantity of heat (measured in Joules) required to raise its temperature by one kelvin. The S
• specific meltingPhysics In physics, melting is the process of heating a solid substance to a point (called melting point) where it turns liquid. An object, which has melted, is molten . Freezing is the opposite of melting. It is the process of turning a liquid to a solid heat
• specific orbital energyIn astrodynamics the specific orbital energy of an orbiting body traveling through space under standard assumptions is the sum of its potential energy and kinetic energy per unit mass. According to the orbital energy conservation equation (also referred t