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| Quiz #471 Results |
| Answers to Quiz #471- March 29, 2015 |
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| Weather Ball Barometer www.enasco.com/product/SB33482M |
The weather ball barometer is based on a simple design by
Goethe. The glass globe is attached to a sturdy base with a
funnel tube on one side. The ball is filled with colored
distilled water. Once filled the air trapped inside the ball is
no longer subject to variations in atmospheric pressure. The
liquid in the indicator tube, however, remains open to the
atmosphere and is directly affected by atmospheric
pressure. When atmospheric pressure rises, the liquid in the
indicator tube is pushed down and an improvement in the
Goethe. The glass globe is attached to a sturdy base with a
funnel tube on one side. The ball is filled with colored
distilled water. Once filled the air trapped inside the ball is
no longer subject to variations in atmospheric pressure. The
liquid in the indicator tube, however, remains open to the
atmosphere and is directly affected by atmospheric
pressure. When atmospheric pressure rises, the liquid in the
indicator tube is pushed down and an improvement in the
1. Measure the barometric pressure at the top and
at the bottom
Measure the barometric pressure (in mm of mercury)
at the base of the building. Take the barometer to the
roof of the building, and measure the pressure again.
The difference tells you the weight of a column of air
the same height as the building. Multiply the pressure
difference (in mm of mercury) by the density of
mercury compared to the density of air around the
building. This gives you the height of the building (in
mm). Use standard tables to convert to the required
unit of measurement.
2. Drop the barometer and time how long it takes
to fall
Take the barometer to the roof of the building. Walk
to the edge. Drop the barometer over the edge and
time how long it takes to hit the ground. You may
either watch the barometer fall, or listen for it hitting
the ground, depending on the height of the building
and the accuracy required. Don't forget to correct for
the speed of sound if listening for the crunch. Use the
fact that height is gravity times the square of the time,
divided by two to calculate height from the (known)
gravity and the (measured) time.
3. Use the barometer as a measuring stick
Place the barometer upright against the wall. Mark the
top of the barometer. Label the mark '1'. Move the
barometer vertically so that the bottom of the
barometer is at the mark. Mark the top of the
barometer, labelling this mark '2'. Continue like this
until you reach the top of the building. Multiply the
number on the last mark by the height of the
barometer. This will be accurate to within one
barometer height. For greater accuracy, add one-half
the height of the barometer to account for the portion
above the last mark.
Note: For tall buildings, some extra equipment may be
required to assist in climbing the wall.
4. Use the barometer as a pendulum
Buy a rope long enough to reach the top of the
building. Tie the barometer to one end and go up on
the roof. Lower the barometer until it is exactly one
inch above the ground. Holding the top of the rope at
the top of the building, swing the barometer, and
measure the period of the pendulum. From this you
can calculate the length of the rope. Add one inch and
you have the height of the building.
5. Measure the shadow of the barometer and the
building
On a sunny day, measure the length of the shadow
cast by the barometer, and the length of the shadow
cast by the building. Multiply this ratio by the height of
the barometer to get the height of the building.
6. Compare the barometer height to the building
height
Hold the barometer one foot in front of yourself and
find a position where the building appears to be the
same size as the barometer. Now measure the distance
to the building (in feet) and multiply by the height of
the barometer.
7. Trade the barometer for a long measuring tape
Go to a local shop and trade the barometer for the
longest measuring tape they have. Take the tape onto
the roof of the building. Holding one end, drop the
other end over the edge of the building. Raise the
measuring tape until the far end is just touching, not
resting on, the ground. Read the height of the building
from the measuring tape.
Note: For particularly tall buildings, this may require a
particularly good hardware store.
8. Offer the barometer to the superintendent
Find the superintendent of the building. Offer him a
deluxe display barometer if he will tell you the height
of the building. If the superintendent is not available,
or doesn't like barometers, try other parties such as
the local survey officer, the original architect, or a
member of the construction crew.
at the bottom
Measure the barometric pressure (in mm of mercury)
at the base of the building. Take the barometer to the
roof of the building, and measure the pressure again.
The difference tells you the weight of a column of air
the same height as the building. Multiply the pressure
difference (in mm of mercury) by the density of
mercury compared to the density of air around the
building. This gives you the height of the building (in
mm). Use standard tables to convert to the required
unit of measurement.
2. Drop the barometer and time how long it takes
to fall
Take the barometer to the roof of the building. Walk
to the edge. Drop the barometer over the edge and
time how long it takes to hit the ground. You may
either watch the barometer fall, or listen for it hitting
the ground, depending on the height of the building
and the accuracy required. Don't forget to correct for
the speed of sound if listening for the crunch. Use the
fact that height is gravity times the square of the time,
divided by two to calculate height from the (known)
gravity and the (measured) time.
3. Use the barometer as a measuring stick
Place the barometer upright against the wall. Mark the
top of the barometer. Label the mark '1'. Move the
barometer vertically so that the bottom of the
barometer is at the mark. Mark the top of the
barometer, labelling this mark '2'. Continue like this
until you reach the top of the building. Multiply the
number on the last mark by the height of the
barometer. This will be accurate to within one
barometer height. For greater accuracy, add one-half
the height of the barometer to account for the portion
above the last mark.
Note: For tall buildings, some extra equipment may be
required to assist in climbing the wall.
4. Use the barometer as a pendulum
Buy a rope long enough to reach the top of the
building. Tie the barometer to one end and go up on
the roof. Lower the barometer until it is exactly one
inch above the ground. Holding the top of the rope at
the top of the building, swing the barometer, and
measure the period of the pendulum. From this you
can calculate the length of the rope. Add one inch and
you have the height of the building.
5. Measure the shadow of the barometer and the
building
On a sunny day, measure the length of the shadow
cast by the barometer, and the length of the shadow
cast by the building. Multiply this ratio by the height of
the barometer to get the height of the building.
6. Compare the barometer height to the building
height
Hold the barometer one foot in front of yourself and
find a position where the building appears to be the
same size as the barometer. Now measure the distance
to the building (in feet) and multiply by the height of
the barometer.
7. Trade the barometer for a long measuring tape
Go to a local shop and trade the barometer for the
longest measuring tape they have. Take the tape onto
the roof of the building. Holding one end, drop the
other end over the edge of the building. Raise the
measuring tape until the far end is just touching, not
resting on, the ground. Read the height of the building
from the measuring tape.
Note: For particularly tall buildings, this may require a
particularly good hardware store.
8. Offer the barometer to the superintendent
Find the superintendent of the building. Offer him a
deluxe display barometer if he will tell you the height
of the building. If the superintendent is not available,
or doesn't like barometers, try other parties such as
the local survey officer, the original architect, or a
member of the construction crew.
weather can be anticipated. When air pressure falls, the greater pressure inside the ball
causes the liquid in the indicator tube to rise, indicating that a deterioration in weather
can be expected.
causes the liquid in the indicator tube to rise, indicating that a deterioration in weather
can be expected.
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| How to Measure the Height of a Building with a Barometer www.esmerel.com/circle/question/building.html |
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| Happy April's Fool Day! |
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