Chemical change which merely involves simple decomposition is thus seen to be influenced by the masses of the reacting substances and the presence of the products of decomposition; in other words the system of reacting substances and resultants form a mixture in which chemical action has apparently ceased, or the system is in equilibrium.
Resultants.-When we are given k homogeneous equations in k variables or k non-homogeneous equations in k - i variables, the equations being independent, it is always possible to derive from them a single equation R = o, where in R the variables do not appear.
Case of Three Variables.-In the next place we consider the resultants of three homogeneous polynomials in three variables.
48), at distances x and x+a from the left abutment, be their resultants on either side of C. Then the reaction at B is WIx/1+W2(x+a)/l.
Let all the resultants acting at the several centres of resistance be produced until they cut one another in a series of points so as to form an unclosed polygon.