Home/ Questions/Q 21021
Next
In Process

Quizzma Latest Questions

In:

Difference between boiling and evaporation

Quizzma Team

What is the difference between boiling and evaporation?




Share
    Leave an answer

    Leave an answer

    Browse

    2 Answers

    1. Anonymous

      Boiling and evaporation are both processes that involve the transition of a substance from a liquid state to a gaseous state, but they have some key differences:

      1. Temperature:
        • Boiling occurs at a specific temperature (boiling point) that depends on the pressure. At sea level, water boils at 100°C (212°F).
        • Evaporation can occur at any temperature, even below the boiling point, as long as there is enough energy for the molecules to escape the liquid surface.
      2. Location:
        • Boiling occurs throughout the entire bulk of the liquid when the vapor pressure equals the atmospheric pressure.
        • Evaporation occurs only at the surface of the liquid, where the molecules with the highest kinetic energy can escape.
      3. Bubble formation:
        • Boiling is characterized by the formation of bubbles within the liquid, which rise to the surface and escape.
        • Evaporation does not involve the formation of bubbles.
      4. Energy requirement:
        • Boiling requires a significant amount of energy to overcome the vapor pressure and create bubbles within the liquid.
        • Evaporation requires less energy, as it only involves the escape of high-energy molecules from the surface.
      5. Rate:
        • Boiling is a rapid process that converts a large amount of liquid to gas in a short time.
        • Evaporation is usually a slower process, as it depends on the surface area, temperature, humidity, and air flow above the liquid surface.
    3. Anonymous

      he difference between boiling and evaporation lies in the conditions under which each process occurs and the characteristics of each process:

      1. Boiling:
        • Temperature: Boiling occurs at a specific temperature known as the boiling point, which is different for each substance (e.g., 100°C for water at sea level).
        • Occurrence: Boiling happens throughout the entire liquid. Bubbles of vapor form within the liquid and rise to the surface.
        • Energy: It requires an external heat source to provide the energy needed for the liquid to reach its boiling point.
        • Pressure: Boiling is influenced by atmospheric pressure; at higher altitudes, where atmospheric pressure is lower, the boiling point of a liquid decreases.
        • Rate: Boiling is typically a rapid process once the boiling point is reached.
      2. Evaporation:
        • Temperature: Evaporation can occur at any temperature, though it happens more quickly at higher temperatures.
        • Occurrence: Evaporation occurs only at the surface of the liquid. Molecules at the surface gain enough energy to escape into the gas phase.
        • Energy: It does not require an external heat source; instead, it relies on the kinetic energy of individual molecules at the surface of the liquid.
        • Pressure: Evaporation is less influenced by atmospheric pressure compared to boiling, though lower humidity can speed up the evaporation process.
        • Rate: Evaporation is generally a slower process and occurs over a longer period of time compared to boiling.

    Related Questions