For practical needs, measures have been used by people since ancient times. This was necessary not only for cultivation of land, but also for housing construction and even in household boards. The unit of measurement often became a certain object – stone, stick, grain, etc. D.
Also, weight measures could be equated with cargoes. For example, the Chinese tribute was 60 kg, that is, the weight that a person could carry on his shoulders. The Icelandic analogue was a Khestur – the weight transported by the horse, and the Persian – Harvar, that is, the weight that the donkey could transport.
For the measure of weight, a bag of salt, flour or grain could be taken. In Rus’ in everyday life was a kul or 100.3 kg oats. And in Japan, an analogue of the bag was a measure of container for bulk substances equal to 72 liters.
The weight of precious stones, as well as metals, was expressed in the mass of barley or rice grains, as well as some others.
It is worth noting that in Rus’ barrels were measured not only fluids, but also weight.
In modern conditions of technology development, an increasing number of diverse technology appears to measure weight. Its representatives have different weighing limits and affordable options. To date, scales of three types are used:
1. scales with a bowl for weighing;
2. scales with removable stands or platform (these include floor scales of which the price of which is most acceptable when used in domestic conditions);
3. Libra with a variety of mounts for weighing.
At the same time, the range of weights is continuously expanding, which allows you to choose the right technique for various needs.
The work of modern scales is based on the principle of measuring the forces of influence on them at the load. In electronic -type scales, the force of exposure read primary converters. And in mechanical weights, weighing is carried out at the expense of gravity and spring.