First of all, expand knowledge.

1, ice cubes

Ice generally refers to solid water made by freezing liquid water. Usually used to cool down or make iced drinks. As required, water can also be poured into the mold to make ice cubes with specific shapes, such as popsicles.

2. Classification of ice

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 the commonly used ice is industrial ice, edible ice and dry ice.

Industrial ice: industrial ice is also called ice, ice bars, ice bricks and so on. Ice is frozen with pure tap water, and the temperature is about MINUS 20 degrees. Ice cubes are widely used in seafood, catering, hygiene and industry. Each ice cube is 50 cm long, 25 cm wide, 100 cm high and 200 kg net weight.

Edible ice: 20 kg of edible ice per bag (edible). Sanitary edible ice particles are made by freezing sterilized edible water at MINUS 20 degrees, which can be used for eating, freezing, preparing drinks, mixing wine in hotels and so on. Drinks are cold, so wine and drinks are cold, refreshing, delicious, economical, applicable and delicious.

Transparent ice: also known as crystal ice and clear ice, transparent ice can be used for scenery, artistic sculpture, decoration, celebration ice sculpture, wedding ice sculpture, reception ice sculpture, wine injection ice sculpture, business meeting ice sculpture, Chinese and English font ice sculpture, theme modeling design ice sculpture, logo trademark ice sculpture, ice-breaking brand ice sculpture, holiday ice sculpture, annual ice sculpture, ice sculpture design, as small as wedding ice sculpture diamond ring and ice sculpture design.

Crushed ice: Crushed ice is ground into powdery ice by an ice crusher, which is very convenient for seafood preservation, and you don't have to break large ice cubes yourself.

3. Physical properties

Ice is a transparent hexagonal crystal structure. Pure water will freeze at 0℃ under normal atmospheric pressure. If water contains impurities, the freezing point of water will decrease with the increase of pressure, and the melting point of ice is the freezing point of water. With the increase of atmospheric pressure, the melting point of ice will also increase.

The melting heat of ice is 33 1.6 ~ 335.7 kJ/kg, usually 335kJ/kg. The specific gravity of ice is related to its temperature, environmental pressure during ice formation, whether there are bubbles in ice and the purity of water. When water freezes, its density decreases and its volume increases.

Generally speaking, when the temperature of ice is 0℃ to -20℃, its average specific heat capacity is 2.1kj/kg k, while the specific heat capacity of water is 4.2kJ/kg, which is only half of that of water. The thermal conductivity of ice is related to its temperature and increases with the decrease of temperature.