Dew and Frost

                               Dew and Frost

    On cold, clear nights the ground is cooled causing the ground to radiate into the atmosphere. If the temperature of the ground reaches the dew point, and also causing the water vapor to form on surfaces near the ground. When the temperature is above freezing , dew is created; and when the temperature is below freezing, the water vapor condenses to form frost.
    Dew is formed when water molecules in the atmosphere slow down as the temperature cools, When the temperature reached the dew point, the molecules start to bundle together on any cold surface. Some water molecules evaporate back into the atmosphere, more molecules replace them.

 
      Frost forms when the dew point is below freezing, causing water molecules to transform directly from vapor to solid ice crystals. Some water molecules may evaporate back into the air, while other molecules replace them.
    Frost damage to crops can become severe. The water in a plant cells can freeze and expand, their cell will be damaged and they can die. Frost damages can also ruin grape harvests.

   

Humidity

                          Humidity

     Humidity to the amount of water vapor in the atmosphere. the quantity of water that the air mass can hold gradually increases over time with the temperature. Saturated air is air mass that is incapable of holding more water vapor. The temperature where saturation is made is known as the dew point (Dew point is the term that most meteorologists use to describe the amount of moisture in the air).

     In hot weather conditions, your body's vital strategies are to sweat, which keeps your body cool. However, with high humidity it makes it much more difficult. In hot weather, your heart pumps blood from the body's core to the skin. When the air is dry, your sweat evaporates easily, this takes some of the body's heat with it. The water vapor in the humid air slows the evaporation process, decreasing the cooling effect.