We Must Think Outside the Rocket Equation

The rocket equation contains three variables. Given any two of these, the third becomes cast in stone. Hope, wishing, or tantrums cannot alter this result. Although a momentum balance, these variables can be cast as energies. They are the energy expenditure against gravity (often called delta V or the change in rocket velocity), the energy available in your rocket propellant (often called exhaust velocity or specific impulse), and the propellant mass fraction (how much propellant you need com...

 Life Works Against the Tide of Entropy

The harsh, demystifying light of science has left the modern biologist with one last miracle, a miracle of organization. Somehow, back in the planet's youth, molecules organized themselves into a structure that could reproduce itself. Dust quickened, and into an inanimate world came animation. All the rest has followed, the flight of the pelican, the fragrance of a baby's skin, the songs of wolf and whale. These latter developments are relatively recent and we know in a general way how they c...

 Eric Glendinning Ball Describes Oxydation

The energy liberated when substrates undergo air oxidation is not liberated in one large burst, as was once thought, but is released in stepwise fashion. At least six separate steps seem to be involved. The process is not unlike that of locks in a canal. As each lock is passed in the ascent from a lower to a higher level a certain amount of energy is expended. Similarly, the total energy resulting from the oxidation of foodstuffs is released in small units or parcels, step by step. The amount...