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MAKING DEW POINTS Remove the label from a tin can, and half-fill it with water. Place a thermometer in the water and record the temperature. Add chips of ice, stir, and record the temperature again when droplets form on the outside of the can. The temperature reading when the droplets form is called the "dew point" for the temperature of the air in the room. Water droplets or dew on blades of grass or flowers in the morning is formed in a similar way, and the temperature at which it forms is the dew point. Repeat this activity in different locations and on different days to compare dew points. If other observations are recorded (e.g., room temperature, humidity), more factors influencing the dew point will be discovered. What would the humidity be like if the temperature of the room and the dew point were close together? (The relative humidity would be very high.) What have we already learned about conducting this experiment in the Sahara Desert?  Any problems with this page? Send URL to
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