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Newton and kilogram are two different types of units used in physics. They represent two different but fundamental properties of matter: force and mass.
A newton (N) is the international unit of force and is named after the British scientist Sir Isaac Newton in recognition of his work in the field of classical mechanics. A newton is defined as the force required to accelerate an object of one kilogram at a rate of 1 meter per second per second. In formula form:
1N = 1 kg*m/s²
A kilogram (kg) is the base unit of mass in the International System of Units (SI) and is defined by the international prototype kilogram (IPK) which is kept by the International Bureau of Weights and Measures. It is a constant quantity of matter that does not change, regardless of where the object is located in the universe.
Although mass and force are different properties, they are closely related to each other by Newton's second law, which states that the force exerted on an object is equal to the mass of that object multiplied by its acceleration (F = m*a). This makes it possible to convert the units of force (newton) and mass (kilogram), provided we consider the acceleration due to gravity. On Earth, this acceleration is about 9.80665 m/s², which means that an object with a mass of 1 kilogram on Earth would have a weight (force) of about 9.80665 newton. It is important to remember that weight and mass are not the same: weight is a force and depends on gravity, while mass is a measure of the amount of matter in an object and does not change with location, even in space.
An example of an object that weighs about a kilogram is a litre bottle of water. On Earth, this weighs about 9.8 newton. For comparison, an apple weighs about 1 newton.