Straw science

Have you ever wondered how a straw works? If so, here's an experiment that will not only show you, but one that might get you and your family "Hooked on Science."

Materials

• Jar with lid
• Straw
• Modeling clay
• Knife

Instructions

STEP 1: Screw the lid on the jar and have an adult use the knife to create a hole in the lid.

STEP 2: Place the straw into the hole. Using the modeling clay, seal up the space around the straw and lid.

STEP 3: Fill the jar up with water until the water flows over the top and screw the lid onto the jar.

STEP 4: Attempt to suck the water out of the jar using the straw.

STEP 5: Remove the lid, place the straw into the water without securing the lid onto the jar and attempt to suck the water out of the jar.

Explanation

When you suck on the straw you lower the air pressure in the straw. When the lid is off, the air pressure pushing down on the water forces the liquid up the straw and into your mouth. You need the lid off in order for this experiment to work.

Jason Lindsey is a Science Outreach Educator with Hooked on Science. Check out his website "Hooked On Science" at hookedonscience.org for webcasts and experiments that might get you hooked on science. Send him your science questions at jlindsey@hookedonscience.org. More science experiments can be found at www.semissourian.com.