Equipment required: A hair dryer, two glass beakers, glasses or glass jars, two thermometers, and enough water to fill one of the beakers or glasses. Fill one beaker with tap water at room temperature and leave the other one empty. Place a thermometer in each beaker. Set the two beakers side-by-side and record the temperatures in each beaker. Using the hair dryer, blow hot air evenly for several minutes on the two beakers and monitor the temperatures in each beaker. How do the two beakers respond to the hot air?