[3]Magnetohydrodynamics.
[4]The Kelvin temperature scale starts with zero at absolute zero instead of at the freezing point of water. Therefore, °K = °C + 273; °K = ⁵/₉ (°F + 460).
[5]Termed valence or conduction electrons, these are responsible for chemical properties, bonds with other atoms, and the conduction of electricity.
[6]See the companion Understanding the Atom booklet, Power from Radioisotopes.
[7]Discovered by Thomas Edison in 1883.
[8]An electron volt is equal to the kinetic energy acquired by an electron accelerated through a potential difference of 1 volt. It is equal to 1.6 × 10⁻¹⁹ joule.
[9]In outer space, waste heat must be radiated away. The rate at which heat is radiated is proportional to the fourth power of Tc (Stefan-Boltzmann law).
[10]The newton and the weber are mks (meter-kilogram-second) units.
[11]An angstrom unit (A) is a unit of distance measurement equal to 10⁻¹⁰ meter.
[12]Dielectric materials are nonconductors such as are those used between the plates of a condenser to increase its electrical capacity.