What is Singing Glasses?

PROCEDURES:

1. Add some water to the glasses.

2. Dip your finger in water and move it around the rim of the glasses.

· Both glasses need to make the same pitch.

· a If the pitch is different add or remove water from the glasses until it is the same sound.

3. Place a toothpick on the rim of one the glasses.

4. The glasses should be close but not touching.

MATERIALS:

Two Wine Glasses, Water, Toothpick.

INTRODUCTION:

Glasses can be used to make sounds at in least two different ways. One of them is rubbing the glasses' rims.

CONCEPT/PRINCIPLE:

As you rub your finger on the rim, your finger first sticks to the glass and then slides. This stick and slide action occurs in very short lengths and produces a vibration inside the glass which in turn produces a sound.
Vinegar helps to clean dirt and oil from your finger. A clean finger improves the stick and slide action. As soon as the first few vibrations are produced, the glass resonates.

SAFETY REGULATIONS: