When the evaporation rate greatly exceeds the condensation rate and the rate of evaporation changes with temperature, pressure, and humidity, a system is generally in a state of rapid evaporation. This phenomenon occurs when the conditions favor the conversion of a liquid substance into a vapor at a significantly faster rate compared to the reverse process of vapor condensing back into a liquid. Let's break down the factors at play:

When these factors combine to create conditions where the evaporation rate is significantly higher than the condensation rate, you'll observe rapid evaporation. This is common in scenarios such as:

• Drying: When you hang wet clothes out to dry on a warm and breezy day, the combination of high temperature, low humidity, and potentially lower pressure (at higher altitudes) can lead to rapid evaporation of the water from the clothes.
• Spills: When you spill a liquid like water or alcohol on a warm surface, the liquid can evaporate quickly due to the temperature and pressure conditions.
• Boiling: In cooking, boiling liquids experience rapid evaporation as they are heated to their boiling points, converting them into vapor.

It's important to note that these conditions can have various effects based on the context. Rapid evaporation can be beneficial for drying purposes but can also lead to material loss, concentration changes, and other consequences, depending on the specific situation.

Dr Kristaq Hazizi thank you for your contribution to the discussion

Low relative humidity values mean that the evaporation rate greatly exceeds the condensation rate. But, because relative humidity depends on the evaporation rate, which depends on temperature, relative humidity doesn't tell us how much water vapor is present in the air. It is the reverse action of evaporation, where liquid water becomes a vapor. Condensation happens one of two ways: Either the air is cooled to its dew point or it becomes so saturated with water vapor that it cannot hold any more water. Dew point is the temperature at which condensation happens. When the air is dry, water evaporates faster than it condenses so there is a net high rate of evaporation. But if the air is very humid, the rate of condensation would be high so even if water evaporated, the net rate of evaporation would not be as high as on a dry day. When condensation and evaporation are equal, this is called saturation. Saturation occurs when air contains the maximum amount of water vapor possible for its given temperature. That is why condensation equals evaporation. If evaporation occurs, the air cannot contain more water vapor, so some must condense. Evaporation can be increased by increasing temperature. While evaporating water, increasing the temperature of the water can increase the evaporation rate, the process of evaporation will occur rapidly because heat will turn water into vapor, and as heat increases, evaporation will also increase. If the temperature increases and the wind speed and humidity stay constant, then the rate of evaporation will increase since warmer air can hold more water vapor than colder air. Although water can evaporate at low temperatures, the rate of evaporation increases as the temperature increases. This makes sense because at higher temperatures, more molecules are moving faster; therefore, it is more likely for a molecule to have enough energy to break away from the liquid to become a gas. The rate of evaporation decreases with an increase in humidity. If there is already water vapour in the air then its tough to add more water vapour into the air. So the rate of evaporation decreases with increase in humidity.

When the evaporation rate greatly exceeds the condensation rate, the relative humidity is low. This is because the air is not holding as much water vapor as it could. The rate of evaporation changes with temperature, pressure, and humidity.

• Temperature: The higher the temperature, the faster the evaporation rate. This is because the water molecules have more energy and are more likely to break free from the liquid surface.
• Pressure: The lower the pressure, the faster the evaporation rate. This is because the air molecules are less crowded and there is more space for the water molecules to escape.
• Humidity: The higher the humidity, the slower the evaporation rate. This is because there is already a lot of water vapor in the air, so there is less space for new water molecules to evaporate.

The temperature at which more condensation than evaporation occurs is called the dew point. This is the temperature at which the air is saturated with water vapor and any additional water vapor will condense.

So, to answer your question, the evaporation rate greatly exceeds the condensation rate when the air is dry, hot, and low-pressure. This can happen in deserts, on hot days, and at high altitudes.

Here are some examples of when the evaporation rate greatly exceeds the condensation rate:

• A wet cloth drying in the desert sun.
• A puddle of water evaporating on a hot day.
• A cloud forming on a mountaintop.
• Sweat evaporating from your skin.

Dr Murtadha Shukur thank you for your contribution to the discussion

When the air is dry, water evaporates faster than it condenses so there is a net high rate of evaporation. But if the air is very humid, the rate of condensation would be high so even if water evaporated, the net rate of evaporation would not be as high as on a dry day. Low relative humidity values mean that the evaporation rate greatly exceeds the condensation rate. But, because relative humidity depends on the evaporation rate, which depends on temperature, relative humidity doesn't tell us how much water vapor is present in the air. It is the reverse action of evaporation, where liquid water becomes a vapor. Condensation happens one of two ways: Either the air is cooled to its dew point or it becomes so saturated with water vapor that it cannot hold any more water. Dew point is the temperature at which condensation happens. When condensation and evaporation are equal, this is called saturation. Saturation occurs when air contains the maximum amount of water vapor possible for its given temperature. That is why condensation equals evaporation. If evaporation occurs, the air cannot contain more water vapor, so some must condense. When condensation occurs, the water vapor present in air release the latent heat of condensation which is given to air. Since air absorbs the heat given out, its temperature increases. Heat is released when a vapour condenses. Unless this heat is removed, the surface temperature will increase until it is equal to that of the surrounding vapour. If the temperature increases and the wind speed and humidity stay constant, then the rate of evaporation will increase since warmer air can hold more water vapor than colder air. The rate of evaporation decreases with an increase in humidity. If there is already water vapour in the air then it’s tough to add more water vapour into the air. So the rate of evaporation decreases with increase in humidity. Humidity is inversely proportional to the rate of evaporation. So the rate of evaporation at a given place is always dependent on the humidity of that place. If the air is already filled with water vapor, it will not have any place to hold excess vapor and therefore, evaporation will occur at an extremely slow rate.