What is measured?
- "How hot did today! Every day is worse than the last." Says one.
- "No," replied another, "Yesterday was warmer than today"
So the conversation could continue indefinitely, it would not come to agreement. The two friends are issuing personal opinions. You need to go to an instrument (a thermometer) for temperature, as of a number and a name (the name of the unit used)
ADVANTAGE COUNT AND MEASURE
Assign a number to a set of things we can put in correspondence sets of different things. The essence of the process of measuring is that we can use numbers to find sums: 70 km, 20 kg, etc. so you can operate them. There
fundamental quantities (length, mass, time, electric current, temperature, ... From the combination of them, by algebraic relationships arise units derived, for example: (m2) square meter for measuring the surface (rad / s) Radian per second, to measure the angular velocity (N) newton to measure strength, etc. MEASURING
comparing, for example,
is easy to measure a length. Probably the first thing the man was measured by the distance between two points by counting the number of steps to traverse. That is, using the step as a unit to meet this magnitude.
But if a comparison is rigorous, be scientific, it needs to establish a unit that is invariable. Therefore, in length, the unit I am: THE METRO.
[D]
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