What causes drinks to fizz?

Drinks fizz because of dissolved gases, most commonly carbon dioxide (CO2). Here's a breakdown of how it happens:

1. Dissolving Gases:

* Carbonation: This is the most common method. CO2 is forced into the liquid under pressure, which dissolves the gas into the beverage. This is how we get fizzy sodas, sparkling water, and even some beers.

* Fermentation: During the fermentation process for alcoholic beverages like beer and champagne, yeast consumes sugars and produces CO2 as a byproduct. This CO2 gets trapped in the liquid, causing it to fizz.

2. Release of Dissolved Gas:

* Pressure Reduction: When the pressure on a carbonated beverage is reduced (like opening a can or bottle), the dissolved CO2 starts to escape from the liquid as tiny bubbles.

* Temperature Increase: As the temperature of the beverage rises, the CO2 becomes less soluble and escapes as bubbles.

* Agitation: Shaking or stirring a carbonated drink also promotes the release of dissolved CO2, leading to more vigorous fizzing.

Why it Matters:

The release of CO2 creates the characteristic fizz, but it also contributes to:

* Flavor and Texture: Fizz adds a unique sensation and flavor to the beverage, making it more refreshing and enjoyable.

* Mouthfeel: The bubbles create a tingling sensation in the mouth, which enhances the overall drinking experience.

* Preservation: In some cases, like in beer, the CO2 helps to preserve the beverage and prevent spoilage.

In summary: Fizz is caused by dissolved gases, primarily CO2, escaping from a liquid due to pressure reduction, temperature increase, or agitation. This process creates the characteristic bubbles and contributes to the flavor, texture, and mouthfeel of fizzy beverages.