Humidity Sensor   Home / SmartQ Sensors  

This sensor measures water vapour content relative to the ambient temperature. 

With this sensor a simple transpiration experiment can be set up and the results analysed in less than 5 minutes.

Sweating Hand
Teaching applications:
  • Transpiration
  • Homeostasis (sweating, control of body temperature)
  • Investigate changes between inhaled and exhaled air
  • Air around a burning candle / spirit lamp

Plant respiration with humidity sensors
Extension and advanced ideas:
  • Two sided transpiration investigation
  • Room environment


0 to 100% RH (Resolution 0.1%)
Accuracy ±2.5% RH at 55% RH, ±5% RH 10 to 95% RH

Available Resources

Downloads Humidity Sensor Manual
Doc No.: DS028 | Issue: 3

Images Gallery

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Teaching Materials

Transpiration by Humidity (Biology (11-14) ebook)
Measure transpiration by changes in air humidity around the leaves of a variety of plants, simple effective practical that is very accessible to students.

View Worksheet Biology (11-14) ebook
Deodorant vs. Antiperspirant (Biology (11-14) ebook)
An activity to go alongside work on temperature control and homeostasis. Encourages discussion about the role of sweating as a natural part of our control systems, and the importance of understanding technical language.

View Worksheet Biology (11-14) ebook
Deodorant vs. Antiperspirant. (Biology (14-18) eBook)
Don't know your deodorant from your antiperspirant? A nice little activity to show how sweating can be controlled and as a side issue the importance of scientific language in describing. Links into sweating as a method of temperature control and as a homeostatic mechanism.

View Worksheet Biology (14-18) eBook
Transpiration and humidity (Biology (14-18) eBook)
A really simple, quick way to make comparative studies of transpiration.Needs 2 paper cups and a humidity sensor.

View Worksheet Biology (14-18) eBook
Which surface is responsible for transpiration? (Biology (14-18) eBook)
Measure the humidity change of both leaf surfaces, take one reading form the other to show net transpiration. Data comes from leaves still attached to plants, so long term studies are possible, Add light and temperature to see effect of the environment.

View Worksheet Biology (14-18) eBook
Burning fossil fuels (combustion study) (Chemistry (11 -14) eBook)
In this investigation a Humidity and Oxygen sensor are used to measure the changes in the air in a bell jar as a candle burns. The amount of air in a bell jar is quite small so students must be prepared to work quickly. Can reveal an unexpected result!

View Worksheet Chemistry (11 -14) eBook
Buring fossil fuels (combustion) (Chemistry (14-18) eBook)
In this investigation a Humidity, Oxygen and Temperature sensor are used to measure the changes in the air surrounding a burning candle. y.

View Worksheet Chemistry (14-18) eBook
Sports clothing dry (Science in Sport (11-18) eBook)
This investigation presents a simple method for comparing the ability of cloth to transfer water. having the correct material for clothing can make a lot of difference in both comfort and health.

View Worksheet Science in Sport (11-18) eBook
Order No. : 3145

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