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le.INSTRUCTIONS:

Step 1. Line up 4 jars.

Step 2. Fill the first jar 1---4 full. Fill the second

jar 1---2 full. Fill the third jar 3

---4

full. Fill the last jar almost to the top. If you wish, add food coloring to each jar.

Step 3. Gently tap the side of the first jar with the spoon. Listen to the sound. Tap the second jar. How is the sound different?

Step 4. Tap the other 2 jars. Listen to the sounds. Tap all 4 jars, 1 after the other. Which sound is the lowest sound? Which sound is the highest?

Step 5. Gently tap on the rim of each jar. How is the sound different?

Step 6. Can you play a simple tune on your water xylophone?

Water Xylophone

MATERIALS:

• 4 glass jars

• Metal spoon

• Food coloring

• Water

THE SCIENCE BEHIND IT:Sound is made of vibrations that travel through solids, liquids, and gases. When the jar is tapped, vibrations travel from the glass (solid) to the water (liquid) and then though air (gas) to our ears. Sound waves change when the amount of water is changed. Less water makes a lower sound or pitch. More water makes a higher sound.