WHEN CAP OF SOFT DRINK IS REMOVED THEN ITS MASS FIRST INCREASES AND THEN DECREASES WHY?
When the cap of a soft drink is removed, there is a phenomenon known as carbonation occurring. Carbonation is the process of dissolving carbon dioxide gas (CO2) in the liquid, which gives the soft drink its fizz.
Now let's break down why the mass of the soft drink appears to increase initially and then decrease:
1. Initial increase in mass: When the cap is removed, the pressure inside the bottle decreases, allowing the dissolved CO2 gas to escape into the surroundings. As the gas is released, it adds to the overall mass of the system for a short period of time, resulting in a momentary increase in mass.
2. Subsequent decrease in mass: After the initial release of carbon dioxide, the liquid gradually loses its gas content through evaporation and diffusion. As the gas molecules escape, they carry away a small portion of the liquid, resulting in a slight decrease in mass over time.
It is essential to note that the combined effect of evaporation and diffusion is happening continuously, even when the bottle is sealed, as gas molecules can pass through the liquid-air interface due to their small size. However, this loss is relatively insignificant when compared to the rapid release of gas that occurs when the cap is removed.
So, although it may appear that the mass of the soft drink increases initially and then decreases, it is primarily due to the escape of carbon dioxide gas.