## Capacity and Temperature

As children study measurement, they learn to focus on the attributes of physical objects, such as length, weight, and capacity. Children learn that considering these attributes can provide answers to questions such as “Which is taller?” “How heavy is it?” and “Which one holds the most?”

A concept that often causes confusion is that of capacity. It is the volume of an object expressed in units of liquid measure. In the customary system of measurements, units of liquid measure are fluid ounce, cup, pint, quart, and gallon. In the metric system, the millimeter and liter are the most commonly used units.

Children learn to make judgments about measurements by directly comparing objects, either by placing them side by side or by holding one in each hand and trying to compare their weights. Children also use simple tools such as a balance. As children make measurement comparisons, they learn to apply words such as tall, taller, and tallest; heavy and light; and holds the most, holds the least.

Teaching Model 18.2: Cups, Pints, and Quarts