This is something that teachers need to keep in mind.

$units of liquid measurements$

We know that many young children judge the amount of liquid in a container based on its level (height of liquid) without paying attention to other dimensions of the container. Importantly, the size of the two containers that receive the content of the original two containers must be identical to make a judgement. Reproduced with permission from Tokyo Shoseki publishing company, Japan. By looking at the height of the liquid in the two containers, we can decide which container had more liquid. One way to indirectly compare the capacities of two containers is to fill up both containers and pour their content into two identical containers. Stage 2: Indirect Comparison of Liquid Volumes If all of the water from the first container can be poured into the second container without completely filling it, then the second container holds more water. If it overflows, the first container is bigger, or is able to hold more water. One way to directly compare the capacity of two containers is to fill up one container and transfer that amount of water into the other. Stage 1: Direct Comparison of Liquid Volumes Below, we discuss experiences that can help students move through these stages. length, weight, etc), students benefit from progressing through the four stages of measurement with liquid volume. Just as with all measurement attributes (e.g. The Four Stages of Measurement with Liquid Volume

Units of liquid measurements