Give three differences between evaporation and boiling?

Answer 1

They are similar in that both result in some of the liquid being lost to the surrounding ambient volume as a gas. The specific gas depends on the liquid. It's called steam when the liquid is boiling water. It's called humidity when it's evaporated water.

They are different in the speed at which the liquid is converted into gas and in the nature of the gas emitted into the air.

For evaporation, the liquid quietly off gases fairly slowly so the amount of gas (molecule sized particles) above the liquid is typically not visible to the naked eye. But for boiling, the liquid bubbles and off gases fairly rapidly so the amount of gas above the boiling liquid is seen as steam (if the liquid is water). We see the steam and not the humidity because the size of steam particles is larger than the molecular size of humidity.

Answer 2

evaporation happens at any temperature above melting point, boiling only at the boiling point.

evaporation happens only at the surface, boiling happens throughout the liquid.

boiling takes energy in (endothermic) to occur, while evaporation lets only the molecules with the highest kinetic energy out, leaving the rest of the water net kinetic energy, so evaporation is exothermic.

the main difference is that boiling happens when heat is added from the bottom and evaporation is when heat is added from the top. For instance, when you boil water in a pot, it is being heated from the bottom, so steam bubbles form at the bottom and rise through the liquid, to the top. It would be evaporation if the heat was added from the top (no bubbles would form). the main difference is that boiling happens when heat is added from the bottom and evaporation is when heat is added from the top. For instance, when you boil water in a pot, it is being heated from the bottom, so air bubbles form at the bottom and rise through the liquid, to the top. It would be evaporation if the heat was added from the top (no bubbles would form).

Answer 3

Both evaporation and boiling involve liquid water changing to water vapor. This is called a "phase change" by chemists. Evaporation occurs any time water is exposed to air (or any other gas, or a vacum) that not at 100% humidity. Boiling is a subset of evaporation that occurs only when water is heated to it's "boiling point", which is 212 degrees F or 100 degrees C (at normal air pressure).

Answer 4

i think that u were asking about the difference between boiling and evaporation.

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.

Answer 5

Similarity between boiling and evaporation: Both boiling and evaporation results in the phase change from liquid state to vapour state. It is takes place at the entire mass of the liquid. It takes place at the surface of the liquid

Answer 6

boiling and evaporation are similar but get mixed up often. boiling happens inside the fluid. evaporation happens on top of the surface of the fluid.