Differentiate between evaporation and boiling

Answer 1

Some key points are

1) Evaporation takes internal energy while for boiling we have to provide external energy or we have to reduce the pressure.

2) As Evaporation takes internal energy therefore evaporation results in cooling while this is not observed in boiling.

3) Evaporation can occur below saturated temperature while Boiling occurs only at and above saturated temperature.

4) Evaporation occurs at only at the liquid/vapor interface while Boiling may occur at a solid/liquid interface.

5) Vapor bubbles are formed in Boiling while in Evaporation there are no bubble formation and no bubble motion.

6) There are different regimes of boiling (like nucleate boiling, transition boiling, film boiling etc.) while these regimes are not present in Evaporation.

7) Rate at which a substance changes from liquid to vapor through Evaporation is much slower than when Boiling.

8) Example of Evaporation are

Water in a lake at 20°C, evaporates to air at 20°C and 60 percent relative humidity since the saturation pressure of water at 20°C is 2.34 kPa, and the vapor pressure of air at 20°C and 60 percent relative humidity is 1.4 kPa. Other examples of evaporation are the drying of clothes, fruits, and vegetables; the evaporation of sweat to cool the human body; and the rejection of waste heat in wet cooling towers.

i am hoping that the above comparison will give you the clear picture about the evaporation and boiling.

Answer 2

Some key points are

1) Evaporation takes internal energy while for boiling we have to provide external energy or we have to reduce the pressure.

2) As Evaporation takes internal energy therefore evaporation results in cooling while this is not observed in boiling.

3) Evaporation occurs below saturated temperature while Boiling occurs at and above saturated temperature.

4) Evaporation occurs at liquid-vapor interface while Boiling occurs at solid liquid interface.

5) Vapor bubbles are formed in Boiling while in Evaporation there are no bubble formation and no bubble motion.

6) There are different regimes of boiling (like nucleate boiling, transition boiling, film boiling etc.) while these regimes are not present in Evaporation.

7) Rate of Evaporation is much slower than the Boiling.

8) Example of Evaporation are

Water in a lake at 20°C, evaporates to air at 20°C and 60 percent relative humidity since the saturation pressure of water at 20°C is 2.34 kPa, and the vapor pressure of air at 20°C and 60 percent relative humidity is 1.4 kPa. Other examples of evaporation are the drying of clothes, fruits, and vegetables; the evaporation of sweat to cool the human body; and the rejection of waste heat in wet cooling towers.

i am hoping that the above comparison will give you the clear picture about the evaporation and boiling.