![]() ![]() No matter how much space the astronaut is made of, its mass remains unchanged everywhere. An astronaut with a mass of 75 kg will have a mass of 75 kg on the moon or in the orbit of the earth or the moon. Mass is a physical quantity that does not change with the change of position of the object above the surface of the earth. So even if the mass of the object is variable, its weight will be different in the center of the earth, on the surface of the earth, and in space. ![]() But the weight of the same object may be different due to positional reasons because the weight is the result of gravity. So, the total amount of matter is called mass. The practical concept of mass is the weight of the object. Newtonian mechanics relates the force and acceleration of a mass of matter. Mass is a basic property of an object that measures the impedance of the acceleration created on the object by the application of force. Feel free to contact us for any feedback.A basic theoretical concept of mass in physics. Lenntech BV is not responsible for programming or calculation errors on this sheet. The English institution for measurement standards is the National Physical laboratory (NPL). The official institution in the US is The National Institute of Standards & Technology (NIST). The official institution from the world standard of measurements is Conférence Générale des Poids et Mesures (CGPM). The institution in The Netherlands that controls the units is Nederlands Meetinstituut (NMi). You can see more on, or on the official site of the BIPM. In 1960, on the 11 th CGPM, the system was named officially International d'Unité. Because more and more countries were interested in the French system, the Bureau International des Poids et Mesures (BIPM) was founded, nowadays: Conférence Générale des Poids et Mesures (CGPM). Only in 1875 the world was beginning to show some interest in the French development.
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