8.34 lbs

At room temperature (70°F or 21°C), a gallon of water weighs 8.33lb (3.78kg).

The melted ice in the cup will weigh more than the frozen ice cubes. The melted ice in the cup will weigh less than the frozen ice cubes.

Answer: When you put water inside the freezer it will turn into ice and the process of turning liquids into solids are called solidification.

Water boiling, melting ice, tearing paper, freezing water and crushing a can are all examples of physical changes. On the other hand, chemical changes are a bit different. In a chemical change, a new substance is formed. The chemical change also usually involves heat, burning, or other interaction with energy.

Water is a liquid at room temperature, but becomes a solid (called ice) if it is cooled down. The same water turns into a gas (called water vapor) if it is heated up. The changes only happen when the substance reaches a particular temperature.

Evaporation happens when a liquid substance becomes a gas. When water is heated, it evaporates. The molecules move and vibrate so quickly that they escape into the atmosphere as molecules of water vapor. Once water evaporates, it also helps form clouds.

Heat (energy) is necessary for evaporation to occur. Condensation, the opposite of evaporation, occurs when saturated air is cooled below the dew point (the temperature to which air must be cooled at a constant pressure for it to become fully saturated with water), such as on the outside of a glass of ice water.

On cold days, water evaporates, but it evaporates more slowly than it would on a warmer day. Although water can evaporate at low temperatures, the rate of evaporation increases as the temperature increases.

Evaporation rates are higher at higher temperatures because as temperature increases, the amount of energy necessary for evaporation decreases. In sunny, warm weather the loss of water by evaporation is greater than in cloudy and cool weather. So, sunny, hot, dry, windy conditions produce higher evaporation rates.

Oceanic water is saturated with salt. The water is evaporated into the air, forms or goes into clouds, and then returns in the form of precipitation. This is what is called the water cycle. When ocean saltwater evaporates, the salt in the water is left in the water.

Blow (preferably warm) air over it by creating a cross-draught or using a fan. (Warmer air holds more moisture.) Place the water in a metal container with a good thermal contact with its surroundings, so that it does not cool down as it evaporates.

When the angle between vertical direction and the glass wall is small, surface tension is stronger and the component of gravity perpendicular to the glass wall is small; consequently, water sticks to the outside surface of the container (or in other words, runs down the side of the container).

A covered pot boils faster than an uncovered one because the cooling presence of the room’s atmosphere is greatly diminished. Once the liquid comes to a boil, the options widen. With placement of the lid, you are attempting to juggle the competing considerations of boil-over, sufficient heat and evaporation.

The higher the temperature, the higher the vapor pressure, therefore the faster water vaporizes. At sea level, water boils at 100°c. Boiling temperature decreases as athmospheric pressure decreases. It takes a fixed amount of heat / energy to evaporate water (once it reaches boiling point?)

However, instant evaporation of an entire lake volume is physically impossible. Heat transfer from hot air to heat up water would also take lots of time. It cannot occur “instantly”. Heating the surface of a lake would over time heat up the water below by conduction and convection.

At room temperature, there is evaporation (I wouldn’t call it excitation). Even at low temperatures, there are some water molecules are have enough energy to escape and that’s why evaporation in water can occur at any temperature (yes, even if the water is in ice).

1.2 hours

Yes, moving water can evaporate faster than still water. When water moves, the molecules rub against each other and this will make the water warmer over time. The higher temperature will make the water evaporate more quickly.

Unless the humidity in the room is 100%, water in a cup absolutely will evaporate in a room with a constant temperature. It will evaporate if the temperature is 40 degrees blow zero (which, by the way is the point where the Fahrenheit and Celsius thermometers read the same). Frozen water will sublimate.

The evaporation of a single drop of water as it falls through an atmosphere in which the lapse rate is 6*5″C/km and the surface temperature either 15°C or 41°C is examined.