Because of gravity, an object has a downward force, which is called gravity, also called weight. It is a measure of the force of an object under the action of universal gravitation. Weight and mass are different, and the unit is Newton.
Under the gravity of the earth, weight and mass are equivalent, but the units of measurement are different. A substance with a mass of 1 kg is called 1 kg when it is subjected to an external force of 9.8 Newton. Weight is usually replaced by a unit of mass, which means multiplying by the acceleration of gravity. In China, gold and beams used to be used as units of weight. Pounds, ounces, carats, etc. Also used as a unit of weight.
For the same object, the weight of the object is measured by dynamometer and the mass of the object is measured by balance. Under the condition of static or uniform linear motion, the results of the two measurements are equal. Therefore, in daily life, people often don't distinguish between quality and weight.