How can we define 1kg, 1m, 1N, 1second
1 kg: It is defined as the mass of a particular international prototype made of platinum-iridium and kept at the International Bureau of Weights and Measures. It was originally defined as the mass of one liter (10-3cubic meter) of pure water. At the Earth's surface, a mass of 1 kg weighs approximately 2.20 pounds(lb).
1m: The meter (abbreviation, m; the British spelling is metre) is the International System of Units (SI) unit of displacement or length. One meter is the distance traveled by a ray of electromagnetic (EM) energy through a vacuum in 1/299,792,458 (3.33564095 x 10-9) of a second.
1N: A newton (N) is the international unit of measure for force. One newton is equal to 1 kilogram meter per second squared.In plain English, 1 newton of force is the force required to accelerate an object with a mass of 1 kilogram 1 meter per second per second.
1 SECOND: The second (abbreviation, s or sec) is the Standard International ( SI ) unit of time.One second is the time that elapses during 9,192,631,770 (9.192631770 x 10 9 ) cycles of the radiation produced by the transition between two levels of the cesium 133 atom.
1m: The meter (abbreviation, m; the British spelling is metre) is the International System of Units (SI) unit of displacement or length. One meter is the distance traveled by a ray of electromagnetic (EM) energy through a vacuum in 1/299,792,458 (3.33564095 x 10-9) of a second.
1N: A newton (N) is the international unit of measure for force. One newton is equal to 1 kilogram meter per second squared.In plain English, 1 newton of force is the force required to accelerate an object with a mass of 1 kilogram 1 meter per second per second.
1 SECOND: The second (abbreviation, s or sec) is the Standard International ( SI ) unit of time.One second is the time that elapses during 9,192,631,770 (9.192631770 x 10 9 ) cycles of the radiation produced by the transition between two levels of the cesium 133 atom.