It is better to use boiled water to freeze ice cubes. Cold water can also be used to freeze ice cubes if it is boiled and cooled. If it refers to tap water, it cannot be used to freeze ice cubes, because tap water is disinfected, but there are still many bacteria. If it is directly used to freeze ice cubes, there will be many bacteria in the ice cubes.

Pure water in nature will freeze at 0℃ under normal atmospheric pressure. If water contains impurities, the freezing point of water will drop with the increase of pressure. The melting point of ice is the freezing point of water, and with the increase of atmospheric pressure, the melting point of ice also increases.

Naturally formed ice is called natural ice, and ice usually made by artificial refrigeration is called artificial ice, machine-made ice or industrial ice, among which there are many kinds of artificial ice, and commonly used ice includes industrial ice, edible ice and dry ice.

Industrial ice, also known as ice cubes, ice strips, ice bricks, etc., is frozen with pure tap water, and the temperature is about MINUS 20 degrees. Large ice cubes are widely used in seafood, catering, hygiene and industry.