Question

В комнате относительная влажность воздуха при температуре 18°С составляет 68%.Спустя некоторое время оконное стекло запотело. До какой температуры охладилось стекло?

Answer 1

1 находим плотность насыщенного пара при 18 градусах
pн1 = 15 , 4 г/м3
2 найдем абсолютную влажность воздуха при 18 градусах
p = рн*0,68 =10. 47 г/м3
опять открываем ВАШУ таблицу и находим точку росы
t р =10 градусов
 ответ температура оконного стекла меньше 10 градусов
 

Answer 2

Relative Humidity and Condensation

When the relative humidity in a room is 68% at a temperature of 18°C, the window glass may become foggy or "sweat" due to condensation. Condensation occurs when the temperature of a surface, such as the window glass, drops below the dew point temperature of the surrounding air. The dew point temperature is the temperature at which the air becomes saturated and can no longer hold all of its moisture, resulting in the formation of water droplets on surfaces.

To determine the temperature at which the window glass cooled down enough to cause condensation, we need to know the dew point temperature. Unfortunately, the provided search results do not contain the necessary information to calculate the exact temperature at which the glass cooled down. However, we can make some general observations.

Factors Affecting Condensation

Several factors can influence the temperature at which condensation occurs on window glass. These factors include:

1. Relative Humidity: The higher the relative humidity, the more moisture the air contains, increasing the likelihood of condensation. 2. Temperature Difference: The greater the temperature difference between the glass surface and the surrounding air, the more likely condensation will occur. 3. Insulation and Ventilation: Proper insulation and ventilation can help maintain a balanced indoor environment and reduce the likelihood of condensation.

Determining the Temperature

To determine the temperature at which the window glass cooled down enough to cause condensation, we need more information, such as the dew point temperature or the temperature difference between the glass and the surrounding air. Without this information, it is difficult to provide an exact temperature at which the glass cooled down.

However, it is important to note that condensation typically occurs when the surface temperature of the glass drops below the dew point temperature of the surrounding air. The dew point temperature can vary depending on factors such as the relative humidity and the amount of moisture in the air. Therefore, it is likely that the glass cooled down to a temperature below the dew point temperature of the air in the room.

Conclusion

In conclusion, when the relative humidity in a room is 68% at a temperature of 18°C, the window glass may become foggy or "sweat" due to condensation. The exact temperature at which the glass cooled down enough to cause condensation cannot be determined without additional information. However, it is likely that the glass cooled down to a temperature below the dew point temperature of the air in the room.