THE PRINCIPLE OF DESAGREEMENT OF THE NOW

Dialogue in a science forum.

- Asexperia (Elvis Sibilia) says: Guys, everything that the Theory of relativity predicts occurs in the present, there is only one now. We have two clocks (one in space and one on Earth) with different times and both are in the present.

- A forist answers: That is false. There is no universal "now"...that is covered by SR and simultaneity. Different frames of references will always disagree on whether two event are simultaneous. We can never see anything as it is "Now".

- Asexperia answers: The principle of the disagreement of the now considers that two observers, one of them at rest and another in movement, do not agree on whether two events are simultaneous or successive. The disagreement is in the now, in the present. The events take a back seat. Relativity is a theory of disagreement.

Elvis Sibilia

THE MEASURE OF THE FUNDAMENTAL MAGNITUDES

To measure is comparing a magnitude (M) with the corresponding unit (u) to determine how many times M contains u.

1- Weight is measured by balancing two forces of opposite senses.

2- Length is measured by sliding a graduated tape over the object.

3- Temperature is measured by the expansion or contraction of a liquid (mercury or alcohol) enclosed in a graduated glass tube.

4- Time is measured by counting equal intervals of an uniform periodic movement and therefore predictable. In a clock of hands the minute hand executes, in an hour, a complete return. One hour, for example, is not a measure of movement, but of its duration. The measures of movement are distance and speed. Clocks count time intervals.

Elvis Sibilia