HUMIDITY. ABSOLUTE HUMIDITY: Absolute humidity (expressed as grams of water vapor per cubic meter volume of air) is a measure of the actual amount of.

Slides:

Advertisements

Similar presentations

Chapter 4 Moisture and Atmospheric Stability

Advertisements

Chapter 5 Atmospheric Moisture. The process whereby molecules break free of liquid water is known as evaporation. The opposite process is condensation,

HUMIDITY AND DEW POINT.

Atmospheric Humidity. Global water cycle: precipitation = evaporation.

Atmospheric Moisture. How does the moisture get in the atmosphere?? EVAPORATION TRANSPIRATION – water evaporated from trees.

After completing this Lesson, you will be able to answer: 1. What is humidity? 2. What is relative humidity? 3. How relative humidity is measured? 4. What.

Unit 4-1: Humidity and Dew Point. REMOVE HEAT Evaporation As molecules in liquid form absorb heat, they evaporate. –Evaporation is the phase change from.

HUMIDITY Chapter 17 Test 4 material. ASSIGNMENT – 10 POINTS WRITE A 1 TO 2 PAGE REPORT ON “THE IMPACT OF THE TRI-STATE TORNADO IN ILLINOIS” DUE IN ONE.

Humidity. Water Vapor Can make up as little as 1/10 th of 1% to 4% of the atmosphere. Scientists agree that it is the most important atmospheric gas when.

Intro Objective 02/28/2012 Tell how dew point and humidity indicate the amount of water in the atmosphere. Benjamin Franklin posed this question for his.

Atmospheric Moisture. What is Atmospheric Moisture Changing forms of water Changing forms of water Energy absorbed and lostEnergy absorbed and lost Latent.

Lab 5: Atmospheric Moisture.

+ Atmospheric Moisture Chapter 4. + Learning Targets LT #1: I can describe the movement of water through the hydrologic cycle. LT #2: I can summarize.

Humidity Specific Humidity = The actual amount of water vapor in the air at a given time and place. Relative Humidity = How near the air is to its maximum.

WATER IN THE ATMOSPHERE CHAPTER 18.1 HUMIDITY AND CONDENSATION.

Saturation = filled to capacity

Moisture in the air. Heavy and Light air Heavy Air: (high pressure) – cold, because the molecules are closer together. – Dry, because nitrogen and oxygen.

1._____process that forms clouds (water cycle 2) 2._____ process that adds heat and changes liquid water to water vapor (water cycle) 3._____what powers.

Water and Atmospheric Moisture

Water in the Air It’s always there. Water is ALWAYS in the Air! It can be in the air as a solid, a liquid or a gas. Solid- Ice Liquid- Water Gas- Water.

Humidity. Remember: Water takes longer to warm and cool because of its high heat capacity. Lots of solar energy is needed to change the state of water!

Water in the Atmosphere. States of Matter Water vapor – gaseous form (0 to 4% by volume) Water – rain, dew, clouds, fog Ice – snow, hail, clouds.

Relative Humidity. Humidity  the measure of the amount of water in the air  high humidity =lots of moisture in the air.

HUMIDITY  Humidity is the amount of water vapor in the air. Water vapor is the gas phase of water and is invisible. Humidity indicates the likelihood.

Concept of Humidity What is the relationship between water vapor holding and temperature? Air hold more water vapour at higher temperature.

Exercise 14 - Pg 203 Atmosphere and Moisture. 3 Forms of Water Three forms or phases - solid liquid, and gas. It is still water; just in different phases.

Humidity Characteristics of water Humidity Condensation.

HUMIDITY BAD HAIR DAY. WHAT IS HUMIDITY? THE WATER VAPOR IN THE AIR (INVISIBLE)

Atmospheric Moisture. How does the moisture get in the atmosphere?? EVAPORATION – liquid to a gas TRANSPIRATION – process of water being taken in and.

Aim: What is Humidity and Dew Point? Do Now: What instruments do scientist use to measure air pressure? Explain why in the daytime a breeze comes from.

1._____process that forms clouds (water cycle 2) 2.____ layer of atmosphere that weather occurs in (atm layers) 3._____ process that adds heat and changes.

Humidity The amount of water vapor in the air.. Expressed two ways Relative Humidity Dew Point.

Atmospheric Moisture. Water in the Atmosphere Water vapor is the source of all condensation and precipitation Essentially all water on Earth is conserved.

Dew Point and Relative Humidity. What is Humidity? Humidity- the amount of water vapor (WV) in the air Relative Humidity- the % of WV in the air compared.

Essential Question: How does WATER in the atmosphere affect weather and climate? What is the most important gas in the atmosphere for weather? What is.

Water in the Atmosphere Chapter 18, Section 1. Water in the Atmosphere  Precipitation – any form of water that falls from a cloud  When it comes to.

Dew Point The temperature that the air needs to be cooled to reach saturation (100% humidity) Cooling the air below the dew point causes the water vapor.

 Heat Energy & Water:  Sublimation: process by which a solid changes directly into a vapor (gas).  When air is dry & temp below freezing, ice and snow.

Humidity and Dew Point. Foldable Make a two flap foldable one side Relative Humidity and the other side Dew Point Should Contain What it is How it is.

Humidity Water Vapour in the Air. The more water vapour in the atmosphere A) the air becomes heavier. B) the air becomes lighter. C) the air stays the.

Aim: What is relative humidity? Do Now: Answer the following in your notebooks; 1)What do you think of when you hear it is humid out? 2)Explain what type.

Atmospheric Moisture (Text Pg 84-92)

Atmospheric Humidity.

Humidity and Dew Point.

It’s not the heat, it’s the humidity.

Humidity Bad hair day.

Aim: What is relative humidity?

Weather Part 3 Humidity.

Water & Humidity Earth Science – S1.

SOMEWHERE OVER THE RAINBOW

How would you describe humidity in your own words?

Atmospheric Moisture Earth Science.

Water in the Atmosphere

Water’s Changes of State

Aim: What is relative humidity?

Water’s Changes of State

Relative humidity and dew point (elt 2, 3, 4)

Atmospheric Sciences 101 Humidity.

Humidity Water in the Air.

Water in the Atmosphere

About 71% of the Surface of the Earth Is Covered with Water.

What do scientists measure?

Weather and Humidity 1.

11.2 State of the Atmosphere

Water in the Atmosphere

Water in the Atmosphere

Moisture in the Atmosphere

Atmospheric Moisture Earth Science.

Atmospheric Moisture and Stability

Presentation transcript:

HUMIDITY

ABSOLUTE HUMIDITY: Absolute humidity (expressed as grams of water vapor per cubic meter volume of air) is a measure of the actual amount of water vapor (moisture) in the air, regardless of the air's temperature. The higher the amount (weight) of water vapor per kilogram, the higher the absolute humidity. RELATIVE HUMIDITY: Relative humidity (RH) (expressed as a percent) also measures water vapor, but RELATIVE to the temperature of the air. In other words, it is a measure of the actual amount of water vapor in the air compared to the total amount of vapor that can exist in the air at its current temperature. WARM AIR CAN HOLD MORE WATER VAPOR THAN COLD AIR, so with the same amount of absolute/specific humidity, cooler air will have a HIGHER relative humidity, and warmer air a LOWER relative humidity.

Humidity Capacity of air is primarily a function of temperature Relative Humidity (RH) = (actual water vapor content) x 100 (max. water vapor capacity of the air) Heated air becomes lower in RH because denominator gets larger Cooled air becomes higher in RH

Saturation vs Air Temperature The actual amount of Water air can hold changes With air temperature Air at 104 F can hold 3 times As much water as 68 F air ! (47 grams vs only 15 grams) Air at 68 F can hold 4 times As much water as air at 0 F (15 grams vs only 4 grams) 32 F 68 F 104 F 4 grams 15 grams 47 grams

Saturation and Dew Point Saturated v. unsaturated air Dew-point temperature – temperature to which air must be cooled to reach saturation (100% RH) water on outside of drinking glass ice on your car window dew and fog

After Saturation Occurs the Air Must Release Extra Water as Fluid Water forms on the outside of a cold glass as the cold Air surrounding the glass chills the air to the Dew Point Temperature The resulting water is not from the glass, the water is from condensation of moisture in the air around the glass

Relative Humidity and Temp. RH fluctuates over a day or season.

Measuring Relative Humidity Sling psychrometer Hair hygrometer

Which environment has higher water vapor content?