<human>:  Explain the difference between density and weight.
<bot>: The primary difference between density and weight is that density is the mass per unit volume of an object, while weight is the measurement of the gravitational force acting on an object. Density is a more general measure in terms of what the item is made up of, defined as the mass of a given object divided by its volume. Weight, on the other hand, is a measure of how much an object is pulled down by gravity. It is usually measured in a standard unit of force, known as the Newton, which is represented by the symbol 'N'.