<human>:  Can you give me an explanation of the difference between a thermometer and a barometer?
<bot>: A thermometer measures temperature, while a barometer measures air pressure. Temperature is a measure of the average kinetic energy of the molecules in the air, while atmospheric pressure is the force exerted by the air as it rises and falls. A thermometer's scale is usually in degrees Celsius or Fahrenheit, while a barometer's scale is usually in units of millibars or inches of mercury.