Nowadays, young people like to run, ride and other sports. Of course, there are also few friends who like to wear watches. One is to watch the time, and the sports watch can also test the speed.
The outer ring of a general sports watch is engraved with numbers such as 500/400/350, which are sequentially reduced. These numbers represent the physical quantity as speed. The unit is km/h, that is, the tachometer. The watch is also the most common calculation scale system in the chronograph. The application of the tachometer is used together with the timing function of the watch itself.
So how do sports watches measure speed? For example, a car driving on a highway, we can see that there is a distance indicator on the highway. When the starting point passes, the stopwatch is started. The second hand starts from 12 o'clock. When moving 1 At the time of the kilometer, the timing is stopped. At this time, the number indicated by the pointer is the average speed of the previous mile; the sports watch has 60 at 12 o'clock, then one minute is taken for 1 km, so the speed is 60 km/h.
