Soldering terminology

An alloy of two metals (A and B) is referred to as a binary alloy whose composition can be represented as a line. Consider an alloy that consists of X grams of metal A and Y grams of metal B (Fig. 1). At the two ends of the line AB , Xg and Yg weights are hanging. The system is in equilibrium when the line is supported in the pivotal point (S). In this situation, the following formula is true for stretches m and n , separated by S

mn= YgXg

Since this ratio corresponds to the principle of a lever, it is also called leverage (lever relation). The percentages of A and B can be illustrated using a line, just as in Figure 2, where the length of the line corresponds to 100 %.