In the formal language of economics, X and Y are substitutes if the demand for X increases when the price of Y increases, or a positive cross elasticity of demand.
Potting mix is the material that goes into a garden pot before you put seeds and plants into it. 1  It keeps the plant in place. 2  It holds water for the plantâs roots to soak up.  It contains nutrients that feed the plant.
1 Drink mix (the solute) is a solid made up of many molecules of a sugar called sucrose. 2  Sucrose is composed of carbon, hydrogen and oxygen atoms. 3  Like water, sucrose has oxygen atoms bonded to hydrogen atoms. 4  The area near the oxygens are slightly negative and the area near the hydrogens are slightly positive.