Lesson Vocabulary Energy - power derived from the utilization of physical or chemical resources, especially to provide light and heat or to work machines. International System of Units (SI) - a system of physical units ( SI Units ) based on the meter, kilogram, second, ampere, kelvin, candela, and mole, together with a set of prefixes to indicate multiplication or division by a power of ten. Joule - the SI unit of work or energy, equal to the work done by a force of one newton when its point of application moves one meter in the direction of action of the force, equivalent to one 3600th of a watt-hour. Kinetic energy - energy that a body possesses by virtue of being in motion. Liter - a metric unit of capacity, formerly defined as the volume of 1 kilogram of water under standard conditions, now equal to 1,000 cubic centimeters (about 1.75 pints). Measurement - the size, length, or amount of something, as established by measuring. Scientific notation - a mathematical expression used to represent a decimal number between 1 and 10 multiplied by ten, so you can write large numbers using less digits. Temperature - the degree or intensity of heat from the average kinetic energy level present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch. Weight - a body's relative mass or the quantity of matter contained by it, giving rise to a downward force.