Essential Question: What is Humidity? Science 7

Next Science Test: “Earth’s Weather” Unit Test Monday, October 12 Study guide is also posted online

Homework: Science NONE

Most Missed Question: Review of the Day The Coriolis Effect causes global winds to curve: A. to the right of motion (clock-wise) in the Northern Hemisphere and to the left (counter-clockwise) in the Southern Hemisphere B. to the left of motion (counter-clock-wise) in the Northern Hemisphere and to the right of motion (clockwise) in the Southern Hemisphere C. toward the equator D. None of the above

Review Demonstration: Observe the graduated cylinder on the front desk. It is filled with oil and water. For reasons that aren’t relevant to us right now, oil and water DO NOT MIX. Just accept it. DISCUSS with your group: Why is the water sinking to the bottom of the cylinder and the oil rising to the top? What does this tell us about water and oil? How is this related to the atmosphere?

Air Pressure: Vocabulary This is the total force or weight of all of the air pushing on a given area; the lower the altitude, the higher this is. AIR PRESSURE This is a device for measuring air pressure. BAROMETER

Weather: Key Vocabulary Two of the systems used to measure temperature: FAHRENHEIT— A temperature scale on which the freezing point of water is 32 degrees and the boiling point of water is 212 degrees CELCIUS– A temperature scale on which the freezing point of water is 0 degrees and the boiling point of water is 100 degrees

Greenhouse Effect Review: What do greenhouse gases do? Absorb and trap infrared radiation What are some examples of greenhouse gases? Water vapor, carbon dioxide, methane What would happen to earth if there was NO GREENHOUSE EFFECT in the atmosphere? Earth would be too cold to support life

Layers of the Atmosphere Review: Altitude Distance above sea level In what layer of the atmosphere is the Ozone Layer located? As altitude increases, the density of air __________.

Global Wind Belts: Vocabulary This is a global wind belt that flow along the border of the troposphere and the stratosphere. It blows from East to West. Jet planes will often fly within this wind belt when traveling westward because it helps them to reduce the travel time. Jet Stream

Key Atmosphere Concepts that you MUST know! As the temperature of air heats up, the air __________ (in other words, it becomes ______ dense) As the temperature of air cools down, the air __________ (in other words, it becomes _______ dense) As Air Density Increases, Air pressure also _________________ As Air pressure Decreases, air density also _________________

Key Atmosphere Concepts that you MUST know! Fluids (such as air) move from areas of ________ pressure to areas of ________ pressure Air pressure is different in different places on Earth because… Because air pressure is different in different places on Earth, air is constantly moving from one place to another, from areas of _______ pressure to areas of _______ pressure within the atmosphere Air moving from areas of high pressure to areas of low pressure parallel to Earth’s surface is called _____.

Today’s Topic: What is Humidity?

Humidity: Vocabulary This is a measurement of the amount of water vapor that is in the air at a given time Humidity

Humidity: Vocabulary This is the point at which, in a given location and a given temperature, the air has achieved its maximum possible humidity. At this point, water vapor in the air is condensing at the same rate as the liquid water in the area is evaporating-- meaning the humidity stays constant. SATURATION The HIGHER the temperature of air, the MORE HUMIDITY it is possible for the air to hold.

Humidity: Vocabulary This measurement is a percentage that tells you the proportion of humidity in the air compared to the amount of humidity the air could hold to reach saturation. RELATIVE HUMIDITY This is the temperature at which a certain amount of air, containing a certain amount of water, will reach saturation. In more simple terms, it is the temperature at which the water vapor in the air will begin condensing and forming moisture on the ground. DEW POINT

Demonstration: As a class, we are going to look at several examples of the concepts that we’ve just talked about to better understand them. Between each example, I will send you back to your tables to record what you have seen and how it related to the different vocabulary words and concepts

Exit Ticket: Access the “Exit Tickets” page of DeBolt’s wiki Click on the link for today’s exit ticket Complete the quiz before leaving class Name format: “your period number, Last name, First name”