frankj1 wrote:depending on its temperature, water weighs about 8.3lbs per gallon.
Also weighs more than ice.
Bet you're not surprised.
Technically it weighs the same no matter what phase of matter it's in (solid, liquid, gas). It's the density that changes.
Water has a neat, but rather basic, phase diagram with a triple point (where solid, liquid, and gas are in equilibrium) right around the freezing point. If you freeze it and pull a vacuum on it, it will sublime - go straight from ice to vapor without going through the liquid phase. When things are freeze dried, this is what they are talking about.
Water is an amazing material. Luckily the solid state is less dense than the liquid state (ice floats) otherwise all of our lakes, streams, rivers, ponds and oceans in the in the northern and southern latitudes would likely be absence of life as we know it.
If ice sank, all bodies of water in the northern and southern latitudes would freeze solid in the winter and likely wouldn't thaw out during the summer.
All hail the water Gods!