How to Fill a Water Barometer or Storm Glass

••• Milos Dimic/E+/GettyImages

A water barometer or storm glass is used to predict stormy weather. It works because of changes in atmospheric pressure. It is usually made with a glass container that has a sealed body and a narrow spout. The spout connects to the body below the water level, which should fill the body halfway. The top of the spout is above the water level and open. When air pressure sinks lower than when the body was sealed with water, the water level in the spout rises above the level in the body. This device can be filled using a combination of hot and cold water, and is best to fill on a good day when the local pressure reads 30 and above.

    Submerse the barometer completely in the hot water until bubbles stop coming out of the spout.

    Place a finger over the spout and move the barometer to the cold water.

    Remove your finger to let the cold water be drawn into the spout.

    Repeat Steps 1 through 3 until the water is about half an inch above the top of where the spout enters the bottle.

    Let the water reach room temperature. This will take about an hour.

    Tip the barometer over and let about half the water in the spout pour out.

    Add food coloring through the spout, if desired.

    Things You'll Need

    • Tub of hot water
    • Tub of cold water
    • Food coloring (if desired)

Related Articles

Glass Barometer Filling Instructions
How to Predict Weather by the Barometer
How to Read a Weather Swan Barometer
How to Build a Submarine for a Kids Science Project
How to Make a Working Heart Model
How to Make an Eyedropper Syringe
How to Fill a Tractor Tire
How to Measure Carbonation in Soft Drinks for a Science...
How to Build a Model Tornado
What Are the 2 Types of Barometers?
How to Make a Hydraulic Lift for a School Project
How to Measure Liquids Using a Graduated Cylinder
Examples of Condensation in Everyday Life
How to Make a Barometer with Mineral Oil
How to Convert Salt Water into Freshwater (Drinking...
How to Use Beakers
How to Float an Egg in Water
How to Recalibrate a Springfield Barometer
Homemade Altitude Chamber

Dont Go!

We Have More Great Sciencing Articles!