In general, it takes three to four hours to make ice cubes. Leaving them in the freezer overnight to make sure they are solid all the way through is recommended.
Ice cubes melt as the molecules of air, water or other substances around the ice transfer heat into the molecules of the ice itself. As the temperature increases, the bonds change inside the ice, entering a liquid phase and turning into water, according to About.com.
The fastest way to melt an ice cube is to transfer heat energy to the ice as quickly as possible. Heat sources such as hot water, fire and an oven quickly melt ice, as does setting ice out in the sun.
Eating ice cubes is bad for a person's teeth as it can lead to small fractures in tooth enamel, according to WebMD. These small cracks can lead to bigger dental problems down the road as they weaken the tooth structure.
Feeding ice cubes to dogs is fine, as long as there is no chewing or choking hazard involved. The ice cubes can be given as a treat or put in a water bowl. Freezing toys and treats in ice for dogs to chew later is also harmless.
It is not known for certain who invented the ice cube. Doctor John Gorrie built a refrigerator in 1844 to aid his yellow fever patients. Some historians believe that this refrigerator contained some form of ice cube tray because he gave his patients iced drinks.
Ice cubes float in water because ice has a lower density than water. This lower density means that ice weighs less than water in its liquid form.
Ice floats in water because ice weighs less than water. Since ice weighs less than water, it also has less density, contributing to its ability to float in water.
An ice cube melts faster in water than it does in air, given equal circumstances. Heat-energy is needed in order for an ice cube to melt. Heat-energy travels faster through water than it does through air.
Ice sometimes shrinks inside of a frost-free freezer because of a process known as sublimation. According to the University of California, Davis, sublimation occurs when a solid, such as ice, quickly vaporizes into a gas without first changing into a liquid.