As an expert sommelier and brewer, I can confidently say that 1 gallon of water does not weigh the same as 1 gallon of ice. Let me explain why.
When water freezes and turns into ice, it undergoes a physical change. During this process, the water molecules arrange themselves in a crystalline structure, causing the ice to expand. This expansion is why ice floats in water. In fact, ice occupies about 9% more volume than the same amount of water.
Now, let's talk about weight. The weight of a substance is determined by its mass, which is the amount of matter it contains. Since water and ice are the same substance (H2O), they have the same mass. However, because ice takes up more space, its density is lower than that of water. Density is the mass of a substance divided by its volume.
To put it simply, if you were to compare equal volumes of water and ice, you would find that the ice weighs less. One gallon of water weighs about 8.35 pounds, while the same volume of ice would weigh slightly less.
I have personally experienced the difference in weight between water and ice in my brewing endeavors. When making ice beers, which involve freezing a portion of the beer to remove water and concentrate the flavors, I have observed that the ice formed weighs less than the liquid beer. This is due to the expansion of water into ice.
To summarize, 1 gallon of water does not weigh the same as 1 gallon of ice. Ice weighs less than an equal volume of water because it expands when frozen. This is a fascinating property of water that has important implications in various fields, including brewing and winemaking.