High evaporation temperature can be caused by several factors, including:

High Pressure: When the pressure is high, the boiling point of the liquid increases, which means that it requires a higher temperature to evaporate. This is known as the vapor pressure-temperature relationship and can be explained by the fact that increasing pressure forces molecules closer together, making it more difficult for them to escape into the gas phase.

Low Humidity: When the humidity is low, the air around the liquid has a lower concentration of water molecules, which can result in slower evaporation rates and higher evaporation temperatures. This is because there are fewer water molecules available to evaporate from the liquid.

Low Airflow: When there is low airflow around the liquid, the air becomes saturated with water molecules and slows down the rate of evaporation. This can lead to a higher evaporation temperature as the water molecules struggle to escape into the air.

High Boiling Point: Liquids with high boiling points require higher temperatures to evaporate. For example, water has a boiling point of 100°C, while ethanol has a boiling point of 78°C. Therefore, it would require a higher temperature to evaporate ethanol than water.

High Surface Tension: Liquids with high surface tension tend to evaporate more slowly because the molecules at the surface of the liquid are more tightly bound together. This can result in a higher evaporation temperature because it requires more energy to break these bonds and allow the molecules to escape into the air.

Overall, high evaporation temperature can be caused by several factors, including high pressure, low humidity, low airflow, high boiling point, and high surface tension. Understanding these factors can help in controlling the evaporation process and optimizing it for specific applications.