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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

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?

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