Archive for the ‘Science Fair Projects’ Category
How does a barometer work? – using a barometer to record data
In learning How to make a Barometer, you will need to learn how to use a barometer to record data. Recording data in learning how does a barometer work, do the followings:
divide each piece of graph paper into seven columns, one for each day of the week.
to keep the data accurate, tape the paper to a wall and place the bottle close by on a flat tabletop.
- Position the bottle in front of the first column, say, Sunday, so that the straw’s red point almost touches the graph paper.
- At the time of day you make your regular temperature, wind, and precipitation measurements, note the position of the pointer and make a small pencil mark on graph paper.
- Move the bottle to the next column.
- Repeat this procedure each day for the duration of your weather window.
How to read a barometer?
In learning How to make a Barometer, you must also learn how to read a barometer. The first thing to do when learning how to read a barometer is to: watch your barometer work each day.
- When snow or rain is likely, the air inside the bottle will be heavier than the air outside the bottle, and so the balloon will stretch out a little, dipping the pointer down.
- A nice day means the air outside the bottle will be heavier than the air inside the bottle and the balloon will press down into the bottle, moving the pointer up.
- Each day, mark the barometer’s pointer’s position on graph paper.
- After the first week, remove the graph paper and replace it with a fresh piece of graph paper for more barometer readings and recordings.
- Connect the dots with lines to create a picture of air Pressure patterns.
Learning how to make a barometer can be very rewarding. By learning how to make a barometer, you will learn much about air Pressure as well as walking out of a middle school science lab with a working barometer for yourself as a souvenir.
Before we show you how to make a barometer, let’s examine what a barometer is and how does a barometer work.
What are barometers? How does a barometer work?
Barometers measure air Pressure and provide information about changing weather pattern. A high Pressure system barometer usually indicates fair weather without precipitation and a low Pressure system suggests warmer clothing and possible precipitation. The date you collect from a barometer may be the first warning of cooler temperatures, increased wind and precipitation to come.
What you need to make a barometer
In learning how to make a barometer, you will need:
medium glass jar with small mouth
4 pieces of graph paper
Red marker with narrow point
How to make a barometer step – by – step
To make a barometer, follow the steps below:
Flatten the straw 1 inch (2.5 cm) from the end.
Cut diagonally from the corner of the flattened end to create a sharp, quill-like point.
color the tip with a red marker.
Cut the balloon in half and stretch the balloon across the jar’s mouth, securing it with a rubber band to create a tight, drumlike surface.
Apply a strip of rubber cement along the stretched balloon from the center of the bottle’s mouth to the edge and carefully place the unflattened end of the straw there, holding it in place until the glue dries.
The straw should stick out about 6 inches (15 cm) perpendicularly from the bottle.
How to find the humidity using a hygrometer
To find the percentage of humidity, follow the nearest curved dotted lines to the right of the chart. If the dry bulb temperature were 70 degrees F, for example, and the web bulb temperature were 62 degrees F, you would find the relative humidity would be 60% which is well within the comfort zone.
Meteorology and the sling hygrometer
What is Meteorology?
Meteorology is the science of weather prediction. Meteorology involves many techniques. However, the accuracy of weather prediction can still be greatly improved with better technology.
Humidity is the amount of water vapor in the air. Humidity makes all the difference in determining whether a warm day is pleasant or muggy and a cool day refreshing or clammy. Meteorologists find the figure for relative humidity by comparing the amount of moisture in the air with the amount it could hold if it were saturated at the same temperature. This is the idea behind a hygrometer.