![]() At the end of the day, the best ice press for you depends on why you're buying it. All we can do as ice ball press manufacturers, distributors, and retailers, is provide the options for customers to choose from. BUT, when you factor in cost and how much marginally better a copper ice press is for 5 to ten times the cost of an aluminum press, it's hard to justify spending that extra money for marginal performance increase. However, if we were to only compare them for effectiveness, copper would win. Copper and Aluminum are completely different materials. The vent design directly relates to how much water is spilled when transforming the ice block from the 4 cavity mold to the perfectly clear ice ball sphere. In the case of the Pressice Barware Ice Ball Press, the engineering team opted for the vent that extends directly down so that water is expelled from the metal ice cavity as quickly as possible. In some versions, this vent comes out the side of the ice ball press, while in others, the vent shoots directly down through the central axis of the sphere. One of the main design features that vary from ice press to ice press is the way that the water is vented out of the metal ice mold. Some presses have handles, but those are entirely unnecessary for proper operation. ![]() There may be various materials used, such as copper and aluminum. ![]() Now this is where we can have major deviations. Stephen Hawkings once said that gravity shares the large structures of our universe, so on our scale the ice block doesn't stand a chance. The specific heat of the aluminum metal is less than water, and as the cold is pulled out of the ice block, gravity does its magic. With more weight, the ice device works faster. The Pressice Ice Ball Press, weighs 4.7 pounds, and there's a reason. The first thing you'll notice when unboxing the ice ball press is the weight of the machine. Gravity is yet another universal rule of ice presses. The ice press metal gets colder as the block ice gets warmer, and the larger the temperature difference (ie heating up the press) the quicker the ice block melts into the iconic ice press sphere shape. When these differences in surface temperature are touching each other, it's a race to reach an equilibrium point. In essence, the metal is 'warm', and the ice block is 'cold'. Whether copper or aluminum, each and every ice ball press relies on thermal conduction to operate. This is a universal rule of ice presses.Thermal conduction should be everyone's favorite subject in school, right? All jokes aside, this is the de facto most important principle in spherical ice ball machines.
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