Chemistry

Chemistry.  It is used all the time.  When we want to see how cold it is, we see on a thermometer.  We use chemistry to make thermometers because we know about mercury.  Mercury is a liquid and it expands and contracts as the air around it is hot or cold. Chemistry is also used to keep plants alive. The plants around us need nitrogen, but they can't get it from the air. Thanks to nodules (that have nitrogen), they stick to plants and give nitrogen.  We have such a life with science on our side!