How to make a Hygrometer

Have you ever wondered how to make a hygrometer? Learning how to make a hygrometer is not difficult. However the how to make a Hygrometer science experiment is more for a middle school science labs project, rather than a fun kid experiment at home.

Once you have learned how to make a hygrometer, your knowledge will come in handy.

All you need to learn how to make a hygrometer is the followings:

What you need to make a hygrometer

Learn how to make a hygrometer by doing the following science experiment.

• 2 identical thermometers with rigid backings
• 1/2 x 6 inch (1.25 x 15 cm) dowel, cut down as needed
• 1.5 inch wood screw
• washer
• carpenter's glue
• cotton
• drill

About the sling hygrometer

The sling hygrometer will give two simultaneous temperature readings. With the aid of the hygrometer chart, you can determine relative humidity with reasonable accuracy. In this middle school science labs experiment, we divide the how to make a hygrometer experiment into two parts.

How to make a hygrometer Part I

• Attach two thermometers back to back with carpenter's glue. If the thermometers have plastic backings, use epoxy glue instead of carpenter's glue.
• Allow glue to dry.
• Drill a hole through the two thermometers at the top of the mountings.
• Drill a hole at the wooden dowel's top.
• Attach the thermometers to the dowel with a 1.5 inch (3.75 cm) wood screw, placing the washer between screw and dowel. Do not tighten the screw all the way. The thermometers should swing freely around.

How to make a hygrometer Part 2

• Stuff cotton under the top thermometer's bulb, fastening it with two thumbtacks if necessary.
• Moisten the cotton with water.
• Holding the dowel, whirl the hygrometer around for 30 seconds before recording the temperature on both thermometers. The wet bulb should now read a lower temperature than the dry bulb since heat is required to evaporate the water.
• Using the hygrometer chart, locate the dry bulb temperature at the bottom.
• Locate the wet bulb temperature at the top, where indicated by the diagonal lines.
• Trace these two lines until they intersect.

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