# GEOG 1200 SMU Module 2: HUMIDITY

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timer Asked: Feb 2nd, 2019
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### Question Description

Module 2:HUMIDITY

Objectives

• To study the concept of humidity.
• To understand use of the saturation curve graph.
• Learn about how relative humidity is measured using a sling psychrometer.

brilliantmind
School: New York University

Attached.

Topic: Module 2: HUMIDITY
Section 1: Understanding Humidity

Section 2: Using the Saturation Curve Graph
Section 3: Measuring Relative Humidity with a Sling Psychrometer
Section 4: Practice Exercises Using Given Sling Psychrometer Values
Section 5: Relative Humidity Measurements

SAINT MARY’S UNIVERSITY

GEOG 1200

DEPARTMENT OF GEOGRAPHY

FUNDAMENTALS OF PHYSICAL GEOGRAPHY

Module 2: HUMIDITY

Objectives
1.

To study the concept of humidity.

2.

To understand use of the saturation curve graph.

3.

Learn about how relative humidity is measured using a sling psychrometer.

Section 1: Understanding Humidity

Terminology
Air can hold up to a certain amount of water vapour (water in a gaseous state) but the amount varies depending on the
temperature. Humidity is a general term that refers to the amount of moisture in air. Some other important terms to
know when dealing with moisture in the atmosphere are:

Specific Humidity (SH): the actual quantity of water vapour in the air, in grams per kilogram (g/kg).
Maximum Specific Humidity (MSH): the maximum quantity of water vapour that could be held in the air at a given
temperature (g/kg). If the air is unsaturated, the SH is less than the MSH.

Relative Humidity (RH): the ratio of SH to MSH, expressed as a percentage:
Equation 1:

Specific Humidity
RH (%) = ----------------------------------Maximum Specific Humidity

x

100

Dew-Point Temperature (DT): the temperature at which air saturation and condensation occur for a given value of
specific humidity. Condensation is the change of water from a gaseous state to a liquid state.

Saturation Curve: a graph (on a separate sheet) showing the relationship between air saturation and temperature.
Once the saturation point is reached, the RH is 100% and no more water vapour can be evaporated into the air.

Example
For reference, an example using the Saturation Curve ...

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Review

Anonymous
Good stuff. Would use again.

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