An ice cube is a small piece of ice, which is typically rectangular as viewed from above and trapezoidal as viewed from the side. Ice cubes are products of mechanical refrigeration and are usually produced to cool beverages. They may be produced at home in a freezer with an ice tray or in an automated ice-making accessory. They may also be produced industrially and sold commercially.
American physician and inventor John Gorrie built a refrigerator in 1844 with the purpose of producing ice to cool air. His refrigerator produced ice which hung from the ceiling in a basin to lower the ambient room temperature. During his time, bad air quality was thought to cause disease. Therefore, in order to help prevent and treat sickness, he pushed for the draining of swamps and the cooling of sickrooms. [1]
Ice cube trays are designed to be filled with water, then placed in a freezer until the water freezes into ice, producing ice cubes. [1] Ice trays are often flexible, so the frozen cubes can be easily removed by flexing the tray. "Twist ice trays" have a simple spring-loaded mechanism with a lever that is used to turn the tray upside down and flex at the same time, such that the cubes that drop are collected in a removable tray below. The spring returns the ice cube tray to its upright position without having to remove it from the freezer, which can save time and reduces accidental mess—though the tray has to be removed to be collected, and the ice cube tray still has to be removed to be refilled. An alternative system is an aluminium tray with a lever that raises the ice cubes, freeing them from the tray. [2] A motorized version of this is found in most automatic ice-making freezers. [3]
While the usual shape of the ice cube is roughly cubical, some ice trays form hemispherical or cylindrical shapes; others produce blocks of ice in seasonal, festive or other shapes. Occasionally, edible items are frozen inside the ice cubes, both at home and in commercial production. [1]
Lloyd Groff Copeman invented a rubber ice tray, after noticing that slush and ice flaked off his rubber boots rather than adhering to them while walking through some woods collecting sap for maple syrup. Recalling this 1928 incident over lunch with his patent attorney, he conducted experiments using rubber cups, which led to practical designs and patents for different types of tray; these included a metal tray with rubber separators, a metal tray with individual rubber cups which was invented in 1933, and a tray made completely of rubber. [4] Guy L. Tinkham, a household product executive, invented the first flexible, stainless steel, all-metal ice cube tray in 1933. The tray bent sideways to remove the ice cubes. [2] Commercial pre-filled disposable ice trays for home freezing are designed to provide better taste and reduced risk of contamination. [5]
Danish inventor Erling Vangedal-Nielsen patented the single-use ice cube bag in 1978. [6] He was inspired to do so after spending a night with friends where their need for ice was in excess of that which could be provided by ice cube trays; he therefore filled standard plastic bags with water and froze them, the ice to subsequently be retrieved with a hammer. [7] The design was subsequently revised to feature individual compartments for each ice cube, with a seal at the bag's entry point. The ice cube bag has subsequently been marketed and adopted worldwide. [8]
Dedicated ice-maker machines can be used to produce ice cubes for laboratories, home, and academic use. Ice cubes are also produced commercially and sold in bulk. [9]
Commercially made ice cubes may be clear, compared to domestically made ice cubes. Cloudy ice cubes occur when water is frozen quickly, or when the water is high in dissolved solids. When water is cooled to its freezing point, and ice starts to form, dissolved gases can no longer stay in solution and come out as microscopic bubbles. However, as ice floats in water, once there is enough ice to form a layer on the surface, the ice layer traps all bubbles within the ice cube. Commercial ice-makers use a flowing source of purified water to make ice with cooling elements at the bottom, allowing the bubbles to be washed away from the top as the cube grows. [10]
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Crushed ice is the term for ice cubes that are crushed or sheared into irregularly-shaped flakes to provide an aesthetic effect to some cocktails. Crushed ice is also used when faster cooling is desired, since the rate of cooling is governed by the number and average radius of the ice particles. Ice is often also crushed to form slushies, which can be both alcoholic and non-alcoholic. Crushed ice melts more quickly than solid ice: it has a greater surface area, so heat transfer is faster compared to solid ice. [11]
An alternative to ice cubes for whiskey on the rocks are so-called whiskey rocks or stones. [12]
Refrigeration is any of various types of cooling of a space, substance, or system to lower and/or maintain its temperature below the ambient one. Refrigeration is an artificial, or human-made, cooling method.
Ice cream is a frozen dessert typically made from milk or cream that has been flavoured with a sweetener, either sugar or an alternative, and a spice, such as cocoa or vanilla, or with fruit, such as strawberries or peaches. Food colouring is sometimes added in addition to stabilizers. The mixture is cooled below the freezing point of water and stirred to incorporate air spaces and prevent detectable ice crystals from forming. It can also be made by whisking a flavoured cream base and liquid nitrogen together. The result is a smooth, semi-solid foam that is solid at very low temperatures. It becomes more malleable as its temperature increases.
Food storage is a way of decreasing the variability of the food supply in the face of natural, inevitable variability. It allows food to be eaten for some time after harvest rather than solely immediately. It is both a traditional domestic skill and, in the form of food logistics, an important industrial and commercial activity. Food preservation, storage, and transport, including timely delivery to consumers, are important to food security, especially for the majority of people throughout the world who rely on others to produce their food.
Freezing food preserves it from the time it is prepared to the time it is eaten. Since early times, farmers, fishermen, and trappers have preserved grains and produce in unheated buildings during the winter season. Freezing food slows decomposition by turning residual moisture into ice, inhibiting the growth of most bacterial species. In the food commodity industry, there are two processes: mechanical and cryogenic. The freezing kinetics is important to preserve the food quality and texture. Quicker freezing generates smaller ice crystals and maintains cellular structure. Cryogenic freezing is the quickest freezing technology available due to the ultra low liquid nitrogen temperature −196 °C (−320 °F).
A frozen meal, prepackaged meal, ready-made meal, ready meal (UK), frozen dinner, and microwave meal is ultra-processed food portioned for an individual. A frozen meal in the United States and Canada usually consists of a type of meat, fish, or pasta for the main course, and sometimes vegetables, potatoes, and/or a dessert. Some frozen meals feature Indian, Chinese, Mexican, and other foods of international customs. Another form of convenience food, which is merely a refrigerated ready meal that requires less heating but expires sooner, is popular.
A refrigerator, colloquially fridge, is a commercial and home appliance consisting of a thermally insulated compartment and a heat pump that transfers heat from its inside to its external environment so that its inside is cooled to a temperature below the room temperature. Refrigeration is an essential food storage technique around the world. The low temperature lowers the reproduction rate of bacteria, so the refrigerator reduces the rate of spoilage. A refrigerator maintains a temperature a few degrees above the freezing point of water. The optimal temperature range for perishable food storage is 3 to 5 °C. A similar device that maintains a temperature below the freezing point of water is called a freezer. The refrigerator replaced the icebox, which had been a common household appliance for almost a century and a half. The United States Food and Drug Administration recommends that the refrigerator be kept at or below 4 °C (40 °F) and that the freezer be regulated at −18 °C (0 °F).
A domestic ice cream maker is a machine used to make small quantities of ice cream for personal consumption. Ice cream makers may prepare the mixture by employing the hand-cranking method or by employing an electric motor. The resulting preparation is often chilled through either pre-cooling the machine or by employing a machine that freezes the mixture.
A cooler, portable ice chest, ice box, cool box, chilly bin, or esky (Australia) is an insulated box used to keep food or drink cool.
An ice spike is an ice formation, often in the shape of an inverted icicle, that projects upwards from the surface of a body of frozen water. Ice spikes created by natural processes on the surface of small bodies of frozen water have been reported for many decades, although their occurrence is quite rare. A mechanism for their formation, now known as the Bally–Dorsey model, was proposed in the early 20th century but this was not tested in the laboratory for many years. In recent years a number of photographs of natural ice spikes have appeared on the Internet as well as methods of producing them artificially by freezing distilled water in domestic refrigerators or freezers. This has allowed a small number of scientists to test the hypothesis in a laboratory setting and, although the experiments appear to confirm the validity of the Bally–Dorsey model, they have raised further questions about how natural ice spikes form, and more work remains to be done before the phenomenon is fully understood. Natural ice spikes can grow into shapes other than a classic spike shape, and have been variously reported as ice candles, ice towers or ice vases as there is no standard nomenclature for these other forms. One particularly unusual form takes the shape of an inverted pyramid.
Auto-defrost, automatic defrost or self-defrosting is a technique which regularly defrosts the evaporator in a refrigerator or freezer. Appliances using this technique are often called frost free, frostless, or no-frost.
An ice pack or gel pack is a portable bag filled with water, refrigerant gel, or liquid, meant to provide cooling. They can be divided into the reusable type, which works as a thermal mass and requires freezing, or the instant type, which cools itself down using chemicals but can only be used once. The instant type is generally limited to medical use as a cold compress to alleviate the pain of minor injuries, while the reusable type is both used as a cold compress and to keep food cool in portable coolers or in insulated shipping containers to keep products cool during transport.
An icemaker, ice generator, or ice machine may refer to either a consumer device for making ice, found inside a home freezer; a stand-alone appliance for making ice, or an industrial machine for making ice on a large scale. The term "ice machine" usually refers to the stand-alone appliance.
Icyball is a name given to two early refrigerators, one made by Australian Sir Edward Hallstrom in 1923, and the other design patented by David Forbes Keith of Toronto, and manufactured by American Powel Crosley Jr., who bought the rights to the device. Both devices are unusual in design in that they did not require the use of electricity for cooling. They can run for a day on a cup of kerosene, allowing rural users lacking electricity the benefits of refrigeration.
A slushy is a type of beverage made of flavored ice and a drink, similar to granitas but with a more liquid composition. It is also commonly called a slush, slurpee, frozen beverage, or frozen drink. A slushie can either be carbonated or non-carbonated; the carbonated version is sometimes called a frozen carbonated drink or frozen carbonated beverage.
An ice pop is a liquid/cream-based frozen dessert on a stick. Unlike ice cream or sorbet, which are whipped while freezing to prevent ice crystal formation, an ice pop is frozen while at rest, becoming a solid block of ice. The stick is used as a handle to hold it. Without a stick, the frozen product would be a freezie.
Shave ice or Hawaiian shave ice is an ice-based dessert made by shaving a block of ice and flavoring it with syrup and other sweet ingredients. On Hawai‘i Island, it is also referred to as "ice shave." In contrast, a snow cone, a similar American dessert, is made with crushed ice rather than shaved ice. The thin ice shavings of shave ice allow for the flavored syrups to be absorbed completely instead of sinking to the bottom. Hawaiian shave ice is derived from a similar ice-based dessert from Japan called kakigōri and thus involves similar production methods.
Lloyd Groff Copeman was an American inventor who devised the first electric stove and the flexible rubber ice cube tray, among other products. He had nearly 700 patents to his name, and he claimed that he could walk into any store and find one of his inventions.
Cold is the presence of low temperature, especially in the atmosphere. In common usage, cold is often a subjective perception. A lower bound to temperature is absolute zero, defined as 0.00 K on the Kelvin scale, an absolute thermodynamic temperature scale. This corresponds to −273.15 °C on the Celsius scale, −459.67 °F on the Fahrenheit scale, and 0.00 °R on the Rankine scale.
Pumpable icetechnology (PIT) uses thin liquids, with the cooling capacity of ice. Pumpable ice is typically a slurry of ice crystals or particles ranging from 5 micrometers to 1 cm in diameter and transported in brine, seawater, food liquid, or gas bubbles of air, ozone, or carbon dioxide.
Nancy Maria Johnson was awarded the first US patent for a hand-cranked ice cream freezer in 1843.
