A solution is a homogeneous mixture of two or more than two components. The amount of solute dissolved per unit solution or solvent is called Strength of solution.  A concentrated solution is one that has a relatively large amount of dissolved solute. A dilute solution is one that has a relatively small amount of dissolved solute. There are various methods of measuring strength of a solution. Molarity is defined as number of moles of solute dissolved in 1 L of the solution. Molality is defined as number of moles of solute dissolved per kg of the solvent. Molarity is a function of temperature as volume depends on temperature. With increase in temperature, volume of solution increases, hence molarity decreases. Molality is not dependent on temperature because mass does not change with temperature. Mole fraction  represents the moles of a solute present in one mole of solution. Normality represents no. of equivalents of solute present in 1 L of solution.