Most people use measurements and metrics every day. They are so ingrained in our normal way of doing things that we often do not realize we are using them. When we drive our car, we watch the gauges, especially the gas, to make sure everything is all right. When we prepare for a vacation and a long drive, we may check the oil and tire pressure to make sure we are not going to have any problems. While following a recipe, we measure the ingredients and make sure the temperature of the oven is within the correct thresholds.
Women expecting babies go to their doctor on a regular basis to monitor how things are progressing.
My doctor performs an ultrasound on me every month. During the ultrasound, he measures the length of the femur, the diameter of the head, and the diameter of the belly. He uses all of these measurements to ensure the baby is progressing as expected. The medical staff also checks my weight each visit to determine if I am gaining the right amount of weight. We even measure how the day is progressing.