water How does altitude affect the boiling point of water Gather your data Altitude ft Boiling Point o F 0 ft 2120º 1000 ft 2101º 2000 ft 2081º 3000 ft 2062º ID: 760442
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Slide1
How does altitude affect the boiling point of
water
?
Slide2How does altitude affect the boiling point of water?
Gather your data
Slide3Altitude (ft)Boiling Point (oF)0 ft.212.0º1000 ft.210.1º2000 ft.208.1º3000 ft.206.2º4000 ft.204.3º5000 ft.202.4º6000 ft.200.6º7000 ft.198.7º8000 ft.196.9º9000 ft.195.0º10000 ft.193.2º
Altitude (ft)Boiling Point (oF)11000 ft.191.4º12000 ft.189.7º13000 ft.187.9º14000 ft.186.1º15000 ft.184.4º16000 ft.182.7º18000 ft.179.2º20000 ft.175.9º25000 ft.167.8º29000 ft.161.5º30000 ft.160.0º
Altitude vs. Boiling Point of Water
http://
www.engineeringtoolbox.com/boiling-points-water-altitude-d_1344.html
Slide4How does altitude affect the boiling point of water?
Gather your data
Plot points representing the data on a grid
Slide5Plot the points using the data from the table.
Scale the axes as appropriate.
Slide6How does altitude affect the boiling point of water?
Gather your data
Plot points representing the data on a grid
Draw a curve (line) representative of the data points
Slide7Altitude (ft)Boiling Point (oF)0 ft.212.0º1000 ft.210.1º2000 ft.208.1º3000 ft.206.2º4000 ft.204.3º5000 ft.202.4º6000 ft.200.6º7000 ft.198.7º8000 ft.196.9º9000 ft.195.0º10000 ft.193.2º
Altitude vs. Boiling Point of Water
http://www.engineeringtoolbox.com/boiling-points-water-altitude-d_1344.html
Draw a line representing the data.Pick 2 points on the graph and draw a line through those points.
Slide8Slide9How does altitude affect the boiling point of water?
Gather your data
Plot points representing the data on a grid
Draw a curve (line) representative of the data points
Label the graph
Title
Label the axes, including units on each axis
Slide10How does altitude affect the boiling point of water?
Altitude ( feet )
Boiling Point ( F° )
Slide11Find an equation of the graphed line
Find the
y
-intercept of the line,
b
Slide12How does altitude affect the boiling point of water?
Altitude ( feet )
Boiling Point ( F° )
The
y-intercept is 212Let b = 212
Slide13Find an equation of the line
T
he
y
-intercept of the line is
b = 12
Slide14Find an equation of the line
T
he
y
-intercept of the line is
b = 12
Find the slope of the line,
m
Slide15Find the slope of the line
Use the points: (0 , 212.0) and (10000,193.2)
Slide16Find an equation of the line
T
he
y
-intercept of the line is
b = 12
The slope of the line is
m
= -0.00188
Slide17How does altitude affect the boiling point of water?
Altitude ( feet )
Boiling Point ( F° )
The equation of the line is:
y = -0.00188x + 212
Slide18How does altitude affect the boiling point of water?
Altitude ( feet )
Boiling Point ( F° )
Slide19The slope of the line is m = -0.00188
What does that actually mean?
Slide20How does altitude affect the boiling point of water?
Altitude ( feet )
Boiling Point ( F° )
Slide21The slope of the line is m = -0.00188
What does that actually mean?
This means that the boiling point of water is lowered by approximately 1.88° for every 1,000 ft. of elevation.
Slide22Notice the altered recipe and increased cooking time for high altitudes.
Slide23Why is the boiling point of water lowered at higher altitudes?
Because the air is thinner at higher altitudes, thus there is less pressure there.
Slide24What is the highest point on the Earth?
What is the highest point in the United States?
What is the highest point in Florida?
Mt. Everest at 29,029 ft.
Mt. McKinley at 20,322 ft.
Britton Hill in Walton County at 345 ft.
Slide25If you were to take a cup of water to a really high altitude, do you think it’s possible that water could boil at room temperature?
https://www.youtube.com/watch?v=Ks4VuXTTKmo
https://
www.youtube.com/watch?v=XoOQNwcrDWE
Slide26At higher altitudes, the pressure is lower and consequently water boils at a lower temperature.
What do you think happens to the boiling point of water if you
increase
the pressure around it?
Slide27Using a pressure cooker increases the pressure around a liquid, which raises the boiling point of the liquid, allowing food to cook at a higher temperature, which causes the food to cook faster.
Slide28Exactly what is boiling, anyway?
A liquid boils at a temperature at which its vapor pressure is equal to the pressure of the gas above it. The lower the pressure of a gas above a liquid, the lower the temperature at which the liquid will boil
.
http://www.chem.purdue.edu/gchelp/liquids/boil.html