What does the law of multiple proportions say

in chemistry, if any 2 elements can combine in more than one ratio or proportion, different compounds with different properties can be created

Step-by-step explanation:

for example, H2O and H2O2 contain the same elements, but in different ratios. because the ratios are different, different compounds are created. H2O is water, while H2O2 is hydrogen peroxide.

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.