Chapter 2: Understanding Weather Mrs. Fantuzzo 2008-2009
Weather and Climate Chapter 2: Understanding Weather Mrs. Fantuzzo
List the four parts to the water cycle.
DO NOW: List the four parts to the water cycle. List the four parts
to the water cycle.
DO NOW: List the four parts to the water cycle. Section 1:
Objectives Explain how water moves through the water cycle.
Describe how relative humidity is affected by temperature and
levels of water vapor. Describe the relationship between dew point
and condensation. List three types of cloud forms. Identify four
kinds of precipitation. Explain how water moves through the water
cycle.
We need to understand 4 terms: Precipitation- Runoff- Evaporation-
Condensation- Explain how water moves through the water
cycle.
Precipitation Def: occurs when rain, snow, sleet, or hail falls
from the clouds onto Earths surface. Runoff Def: Water, usually
from precipitation, that flows across land, and collects in rivers,
streams, and eventually the ocean. Evaporation Def: occurs when
liquid water changes into water vapor, which is a gas. Condensation
Def: occurs when water vapor cools and changes from a gas to a
liquid.Clouds form by this process. Describe how relative humidity
is affected by temperature and levels of water vapor.
First we need to understand these terms: Humidity- the amount of
water vapor in the air*The airs ability to hold water vapor depends
on the temperature. As temp. INCREASES, the amount of water vapor
that can be held in the air INCREASES. Relative Humidity- the ratio
of the amount of water vapor in the air to the maximum amount of
water vapor the air can hold at a set temperature. Describe how
relative humidity is affected by temperature and levels of water
vapor.
SATURATED UNSATURATED Describe how relative humidity is affected by
temperature and levels of water vapor.
Sample Problem 1. Count the number of people in the room _____ 2.
Count the number of seats in the room _____ How saturated is our
classroom today? Number of people in the room x 100 = % of
saturation Number of seats in the room Describe how relative
humidity is affected by temperature and levels of water
vapor.
Math Practice Assume that 1 m3 of air at 25 C contains 11 g of
water vapor.At this temperature, the air can hold 24 g/m3 of water
vapor.Calculate the relative humidity of the air. Formula: Actual
water vapor content (g/m3) x 100= Relative Humidity (%) Saturation
water vapor content (g/m3) Describe the relationship between dew
point and condensation.
Mini Experiment on Wednesday List the three types of cloud
forms
Cumulus- puffy, white clouds; flat bottoms Altocumulus- (middle
altitude cumulus clouds) Cumulonimbus- (cumulus clouds that produce
precip.) Stratocumulus- (mixture of stratus/cumulus) Cirrocumulus-
(high altitude cumulus clouds) Stratus- layered, cover a lot of
area Nimbostratus- (stratus clouds that produce precip.)
Altostratus- (middle altitude stratus clouds) Cirrostratus- (high
altitude stratus clouds) Cirrus- made of ice crystals; only found
in high altitudes List the three types of clouds List the three
types of clouds
Stratocumulus Cumulus Stratus Cirrus Cumulonimbus Identify four
types of precipitation HomeworkOptions 1.Create a cloud model-
using cotton balls make a model of at least 4 different cloud
combinations.Include labels! 2.On paper, recreate Figure 6 on page
43.Include all labels and definitions of each cloud type and
prefix. 3.Write a short story describing the travel of a water
molecule from the moment it evaporates to the moment it returns to
the sea.Include a picture if you wish.
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