Difference between Mass and Weight

Mass is defined as the amount of matter an object has. However, the weight of an object on earth depends on the force of attraction (gravity) between the object and earth. In one of the more common definitions, the weight of an object, often denoted by W, is defined as being equal to the force exerted on it by gravity. This force is the product of the mass m of the object and the local gravitational acceleration g. Expressed in a formula: W = mg
An equipment used to measure the mass of an object is the scale or the beam balance.
An equipment used to measure the weight of an object is the spring balance or the compression balance.
The mass of object is constant everywhere while he weight of an object changes from place to place.
The SI unit for mass is kilogram while the SI unit for weight is Newton.