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.
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.
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.
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 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.
The best way to keep an ice cube from melting is to use a cooler or another insulating container. You can also use a bag covered with a towel or other thick cloth to trap the cool temperature.
How long it takes water to become ice depends on the temperature of the water, how much water you have and how cold the freezing environment is. For water to freeze, it must reach 32 degrees Fahrenheit.
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.