human
What is the difference between a thermometer and a thermostat?
assistant
The main difference between a thermometer and a thermostat is that a thermometer measures temperature, while a thermostat controls it. A thermometer is used to measure temperature in an environment, whereas a thermostat is used to regulate the temperature of a system or process. Thermometers are typically made up of two parts: a stem and a bulb. As the temperature changes, the stem will move inside the bulb, which causes the bulb to expand or contract. This movement is what allows the thermometer to accurately measure temperature. A thermostat on the other hand uses a bimetallic strip to control temperature. When the temperature rises above the set point, the bimetallic strip contracts and turns off the heat source. When the temperature drops below the set point, the bimetallic strip expands and turns on the heat source.