Multiple choice

Which gas is present under pressure in soft drinks?

  1. oxygen

  2. nitrogen

  3. carbon dioxide

  4. nitrous oxide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Carbon dioxide is dissolved under pressure in soft drinks to create carbonation. When the bottle is opened, pressure decreases and CO2 comes out of solution as bubbles, creating the characteristic fizz. This is why soft drinks are called 'carbonated beverages' - they contain dissolved CO2 gas.

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