How to Make a Weather Barometer

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Be a backyard meteorologist with your own homemade barometer and make weather forecasts like the pros.

Step 1: Wash bottle and jar
Wash a 12-ounce clear glass bottle that has a straight neck and an 18-ounce clear glass jar, making sure to remove any labels.

Tip
An empty 18-ounce peanut butter jar is a good choice for this barometer project.

Step 2: Assemble barometer
Assemble the barometer by first placing the bottle inside the jar in an inverted position. Fill the jar with just enough water to come up over the mouth of the bottle by an inch or so.

Step 3: Add food coloring
Add a few drops of food coloring to the water before slightly tilting the jar to allow air bubbles to release from the bottle.

Step 4: Place rubber band
Place the rubber band around the outside of the jar at the water level.

Step 5: Find a station spot
Find a spot to set up your barometer station where it's not exposed to direct sun, artificial temperature changes, or in a location where it could be accidentally tipped over.

Step 6: Observe water levels
Observe water levels rise as air pressure rises to predict fair conditions, and drop as pressure falls to predict rain. Now, you'll never have to look farther than your own barometer station to forecast the next picnic day or when to pack an umbrella.

Did You Know?
Since 1977, Banner Elk, North Carolina, has celebrated the weather-predicting wooly worm with an annual festival.

[caseycando]

At 1:13 you can see the guy has a lighter and crack pipe in the arm rest of his folding chair.

[aquaticthumb]

Sam krieger

1 second ago
The air flows between the two bottles pressing on the liquid, it is not compressible. The air in the top bottle compresses /decompresses allowing the water to travel in the neck of upper bottles. the formula is pressure, temperature and volume one stays the same the other two are inversely proportional. I believe Boyle's law .

[MatthewTigerSwanson]

Guess who's getting an a with their Science project... THIS GUY thank you Howcast although some of them are pointless

[katiedollar]

does it need to be glass?
I have plastic only

[change_da_world]

thanks, I needed to make a weather instrument for a school project

[kevindriscoll]

How's the guy's weed pipe in the cupholder! hahahaha

[tdstudd]

@winnetounsoci water an not escape a solid object.. your theory is somewhat correct but if you have a water bottle exposed to sunlight water will not go through plastic..it may steam but the plastic atoms are to compact to let water out of it.. same with the bottle

[theman]

cool but can someone explain how this works? Does the air pressure push on the bottle and displace the water?

[aharris]

12 people forgot to pack an umbrella on a rainy day

[itsfarouk]

this video gave me my information thank you

[keithgrybowski]

Nice pipe in the seat. Just what kids need to know.

[HaroKid]

It took some guy on the internet for you to realize that?

[jehangunao]

beause she put a food coloring yellow

[Normanb]

The issue with this is that water will evaporate to mess up reading

[azeezatoseni]

Hey I'm making a barometer tank u

[am_i_still_ill]

I don't remember posting that comment.... or like a dozen O.o I think I was hacked....