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📘 Why does a fizzy drink go flat?

Carbonation Is Dissolved Carbon Dioxide A fizzy drink contains carbon dioxide, or CO2, dissolved in its liquid. In a sealed bottle or can, the drink is made under high CO2 pressure and then kept in contact with that pressurized gas. Some CO

4
lessons
~20 min
to learn
Adults
level
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What you’ll learn

  1. The Drink Is Holding Extra GasExplain dissolved CO2, pressure, and Henry's law as the starting conditions for carbonation.A sealed, pressurized container keeps more CO2 dissolved than open air can support.
  2. Opening Changes the EquilibriumTrace how opening, nucleation, and pouring provide routes for supersaturated CO2 to escape.Lower pressure and new bubble surfaces move the drink toward flatness.
  3. Temperature and Time MatterConnect temperature, refrigeration, resealing, and time with carbonation loss.Cold and a tight cap slow CO2 loss, but do not restore gas already gone.
  4. What Your Mouth Calls FizzSeparate carbonation chemistry from taste and explain the trigeminal contribution to fizz perception.Fizz is a chemical and mechanical oral sensation interpreted by the nervous system.

Questions this course answers

Why can a sealed fizzy drink contain more dissolved CO2 than an open drink?

Henry's law links dissolved gas concentration with gas pressure above the liquid.

Put the main flatness mechanism in order.

Opening changes pressure first; escape continues until a new equilibrium is reached.

Match each change to its effect on carbonation.

Pressure, temperature, nucleation, and storage all affect how quickly dissolved CO2 leaves.

Which statement best describes the sensation of fizz?

Carbonation can form carbonic acid and stimulate oral nerve endings, while bubbles add mechanical stimulation.

Why does resealing a cold drink slow flatness but not completely restore it?

The container can move the remaining drink toward a colder, higher-pressure equilibrium, but it cannot pull escaped CO2 back from the room.

Grounded in trusted sources

  • OpenStax, Chemistry 2e, Solubility - https://openstax.org/books/chemistry-2e/pages/11-3-solubility
  • Chemistry LibreTexts, Solubilities of Gases - https://chem.libretexts.org/Courses/University_of_California_Davis/UCD_Chem_002B/UCD_Chem_2B/Text/Unit_II%3A_States_of_Matter/13%3A_Solutions_and_their_Physical_Properties/13.05%3A_Solubilities_of_Gases
  • OpenStax, Anatomy and Physiology 2e, Gas Exchange - https://openstax.org/books/anatomy-and-physiology-2e/pages/22-4-gas-exchange
  • USGS, CO2 solubility model - https://www.usgs.gov/publications/improved-model-calculation-co2-solubility-aqueous-solutions-containing-na-k-ca2-mg2-cl
  • McCaughey et al., Carbonated water oral sensation - https://pubmed.ncbi.nlm.nih.gov/10866986/
  • Puleo et al., Sparkling sensitivity and consumption frequency - https://pubmed.ncbi.nlm.nih.gov/34399552/
  • Chemistry LibreTexts, Pressure and Temperature Effects - https://chem.libretexts.org/Courses/University_of_Arkansas_Little_Rock/Chem_1403%3A_General_Chemistry_2/Text/13%3A_Solutions/13.03%3A__Pressure_and_Temperature_Effects_on_Solubility

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