An international system of seven units that are the basis of all measurements is supervised by the Bureau International des Poids et Mesures (BIPM) in Paris. It is used as is by most countries except the United States where the metric system is not as widely used as elsewhere.
That said, some of the units presented below are not part of the basic units of the interrnational system but are relevant and used in watchmaking.
Time is measured in seconds, which can be broken down into other units.
The mass is measured in grams but also in other units depending on the region where you are.
The length is measured in meters, which can be declined in other units.
The temperature measures the degree of agitation of the particles. It is low when the degree of agitation is low and it is higher when the degree of agitation is high.
Electrical current is measured in amperes and can be compared to the flow and speed of a river.
Luminous intensity is a measure that expresses the capacity of a light source to illuminate.
Frequency is the measure of the number of times a periodic phenomenon repeats itself in a defined unit of time. The two main units used in clock-making are hertz or vibrations per hour.
Vickers hardness measures the imprint left on a material by a part of a defined size applied to a defined force. The dimension of this imprint defines the hardness of the part.
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