The Science Behind the Disappearance of Naphthalene Balls

Naphthalene balls are commonly used as a moth repellent and to prevent musty odors in closets and drawers. However, over time, these balls tend to disappear without leaving any residue. This phenomenon can be explained by the process of sublimation.

Sublimation

Sublimation is the process by which a solid substance transforms directly into a gas without passing through the liquid state. This occurs when the vapor pressure of the solid exceeds the atmospheric pressure. In the case of naphthalene balls, the molecules of the substance evaporate directly from the solid state, without leaving any liquid residue.

Naphthalene Balls and Sublimation

Naphthalene balls are composed of naphthalene, a white crystalline material that easily sublimes. When exposed to air, naphthalene molecules start to sublimate, transforming into a gas. As the vapor pressure of the naphthalene increases, more molecules evaporate from the surface of the ball. Over time, this process continues until all the naphthalene has sublimated, leaving no residue behind.

The Influence of Temperature and Humidity

The rate of sublimation of naphthalene balls is influenced by temperature and humidity. Higher temperatures and lower humidity levels increase the rate of sublimation, leading to faster disappearance of the naphthalene balls. Conversely, lower temperatures and higher humidity levels slow down the rate of sublimation, prolonging the lifespan of the balls.

Conclusion

In summary, naphthalene balls disappear without leaving any residue due to the process of sublimation. The naphthalene molecules evaporate directly from the solid state, transforming into a gas without passing through the liquid phase. The rate of sublimation is influenced by temperature and humidity levels, with higher temperatures and lower humidity levels leading to faster disappearance of the balls.

Naphthalene balls disappeared with time without leaving behind any residue because naphthalene balls undergo sublimation .The naphthalene balls keep on forming naphthalene vapour slowly which disappear into the air .