Vernier Software and Technology
Vernier Software & Technology

Relative Humidity

Figure from experiment 26 from Earth Science with Vernier


If you live in a place where it gets hot and muggy, you know about humidity. Humidity is a measure of the amount of water vapor in the air. When meteorologists report humidity, however, they are usually referring to the relative humidity. Relative humidity is the amount of water vapor in the air compared to the maximum amount it can hold. The maximum amount of water vapor air can hold varies depending on its temperature – warm air can hold more water than cold air.

One way to measure relative humidity is by observing how easily water evaporates. The drier the air, the faster water will evaporate. Have you ever noticed that you feel cooler when you have just stepped out of the water? This is because as water evaporates, it cools the surface it evaporated from. If we measure how much a Temperature Probe cools as water evaporates off of it, we can calculate the rate of evaporation and therefore the relative humidity.

In this experiment, you will use two Temperature Probes to determine relative humidity at several different locations.


In this experiment, you will

  • Measure temperature.
  • Determine relative humidity.
  • Explain your results.

Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Standards Correlations

See all standards correlations for Earth Science with Vernier »

Earth Science with Vernier

See other experiments from the lab book.

1Introduction to Data Collection
2Exploring Magnetism
3Where IS North?
4Searching for Iron Ore
5Sea Floor Spreading
6Soil pH
7Soil Salinity
8Soil and Acid Rain
9Soil Temperature
13Total Dissolved Solids
14Water Treatment
15Salinity of Ocean Water
16Acid Rain and Its Effect on Surface Water
17Freezing of Ocean Water
19Mapping the Ocean Floor
20Are All Sunglasses Created Equal?
21Comparing Sunscreens
22UV Light and Clothing
23Reflection and Absorption of Light
24The Greenhouse Effect
25Land and Sea Breezes
26Relative Humidity
27Dew Point
28Wind Chill
29Seasons and Angle of Insolation
30Fossil Fuels
31Solar Homes
32Photovoltaic Cells
33Wind Power
P1Air Temperature
P2Air Temperature and Relative Humidity
P3Ground Temperature
P4Barometric Pressure
P5Measuring Particulates
P6Weather Stations

Experiment 26 from Earth Science with Vernier Lab Book

<em>Earth Science with Vernier</em> book cover

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

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