The density of water at 90 degrees Celsius is approximately 0.965 grams per cubic centimeter. This means that one cubic centimeter of water at 90 degrees Celsius weighs 0.965 grams. To find the volume of water at 90 degrees Celsius, you would need to divide the mass of the water by its density. For example, if you have 100 grams of water at 90 degrees Celsius, the volume of the water would be approximately 100 grams / 0.965 grams per cubic centimeter = 103.6 cubic centimeters.