Press a warm quarter firmly against a chunk of dry ice. The quarter will scream loudly as the heat of the quarter causes the dry ice to instantly turn to gas where the two make contact. The gas pressure pushes the quarter away from the dry ice and, without contact, the dry ice stops sublimating. The quarter falls back into contact again, and the cycle repeats. This happens so quickly that the quarter vibrates, causing the singing sound. (gloves, quarters, dry ice) 6. Dry Ice in Warm vs Cold Water Place a small amount of dry ice into a small cup/beaker of cold water and a small cup/beaker of warm water side-by-side. Have the kids compare their observations and offer an explanation as to why one may look different from the other. The warm water
