Add about 2 ml of alcohol to the beaker and clean the inside with the tissue. Be sure the beaker is dry before you proceed.
Pack the beaker with ice cubes up to, but not past, the 100 ml mark. Use the tongs to handle the ice--do not use your fingers.
Zero the scale and weigh the beaker to highest accuracy. Note the weight.
Place the beaker on the hotplate and apply low heat until the ice has just melted. Remove the beaker immediately.
Weigh the cylinder and note the weight.
Pour the water into the cylinder, taking care that none remains in the beaker. Wait about a half-hour, or until the water is at room temperature.
Raise the cylinder to place the water mark directly in front of your best-trained eye. The volume is the cylinder mark corresponding to the curved surface of the water, called the meniscus. Note the volume, which is the volume of ice.
Weigh the cylinder and note the weight. Subtract the empty cylinder weight to arrive at the weight of ice, and note the result.
Calculate the density of ice using the following formula:
Density of ice = weight of ice/volume of ice.
The result is expressed in grams per ml. For most practical purposes, this is equivalent to grams per cubic centimeter.