Water and ice are in fact one of them: the lowest-energy distance between water molecules is actually larger than the closest space that you can pack them when they are liquid, which is why ice is actually less dense than liquid water.

As you know, water can behave differently - be in the gas, liquid or ice form. Water "decides" in which stage to be mostly because of temperature. So if the water is in gas form in the air suddenly gets somewhere where its too cold to be a gas, it turns in to water.

Water can absorb a very large amount of heat and only a small increase in its overall temperature. This property of water, its high heat capacity, is part of what allows life as we know it to exist on this planet by regulating global climate.

If water takes four minutes to reach say 80 degrees, air would only take one or two. Because the water and air in the same place, say on the same beach, are exposed to sunlight for about the same lengths of time, water is actually colder than air during the day.

If condensation is gaseous water vapor cooling down and turning into liquid water, the opposite process is liquid water heating up and turning into gaseous water vapor. This process is called evaporation, and you've probably seen it many times!

The question you have to ask is: is the object that you are putting into the water heavier or lighter than the amount of water that would get pushed out of the way and up if it sank? If it is heavier, then the weight of the object will cause it to sink. If it is lighter, then the weight of the water will keep the object floating.

Water has a huge heat capacity, meaning that the amount of energy required to raise a given volume of water by a certain number of degrees is much greater than the amount of energy required to do the same to most every other substance around.

Water is evaporating all around us all the time - constantly from the ocean, constantly from rivers, and constantly from plants and trees - you should look up what is called The Water Cycle to see how rain clouds form and water is recycled on Earth.

If you could collect only the water that is displaced by the egg and weigh this amount of water, it will give you what is called the buoyant force, which is the upward force exerted by the water on the egg.

Water is composed of water molecules, which when heated up, either on your stovetop in the case of a pot of water or by the sun in the case of a lake, start moving faster. They can translate faster, rotate faster and vibrate a little faster too.