The definition seems obvious until you actually try to pin it down — and the story of how "soft drinks" got their name, and their fizz, starts with a scientist who wasn't even trying to invent a drink at all.
What's Actually Inside a Soft Drink
Strip away the branding and every soft drink is built from a handful of core components, combined in different proportions.
Water (Still or Carbonated)
The base of almost every soft drink, whether that's plain water or water infused with carbon dioxide for fizz.
Sweetener
Sugar, high-fructose corn syrup, fruit juice, or a sugar substitute like aspartame or sucralose in diet versions.
Flavouring
Natural extracts, fruit concentrates, or artificial flavour compounds, often combined with acids for tartness.
Colourings & Preservatives
Used to maintain appearance and shelf life. Some soft drinks also contain caffeine as an added ingredient.
Why Are They Called "Soft" Drinks?
The name is simpler than it sounds — it's a direct contrast with "hard" drinks, meaning alcoholic ones. A soft drink is, by definition, non-alcoholic, though a small amount of naturally occurring alcohol (under about 0.5% ABV) is still generally permitted under the classification in most countries without the drink being considered alcoholic.
A Discovery That Wasn't Trying to Invent a Drink
The entire modern soft drink industry traces back to an accident in a brewery.
1767Scientist Joseph Priestley, living next to a brewery in Leeds, England, suspends a bowl of water above a fermenting beer vat. The rising carbon dioxide dissolves into the water, creating the first artificially carbonated water.
1772Priestley publishes his method, "Directions for Impregnating Water with Fixed Air," and is awarded the Royal Society's Copley Medal for the discovery.
EarlyCarbonated "soda water" is sold in apothecaries, believed (incorrectly) to have medicinal properties, including preventing scurvy.
1783Johann Jacob Schweppe develops a practical process for manufacturing bottled carbonated water, founding what becomes the Schweppes company — selling what's considered the world's first commercial soft drink.
Per McGill University's Office for Science and Society, Priestley's soda water was genuinely believed to help prevent scurvy on long sea voyages, even though this benefit turned out to be false — it simply tasted better than stagnant stored water.
Not Every Soft Drink Is Fizzy
Carbonation gets most of the attention, but the "soft drink" category is broader than the cans on the fridge shelf.
Carbonated
Fizzy Soft Drinks
Cola, lemonade, ginger ale, and craft sodas — anything with dissolved CO2 giving it bubbles.
Non-Carbonated
Still Soft Drinks
Squash, cordial, still lemonade, iced tea, and flavoured waters — no bubbles, but still fitting the broader soft drink definition.
What Do You Call It Where You're From?
Regional naming for soft drinks varies enormously, even within English-speaking countries — a genuinely fun linguistic quirk of a single product category.
Is beer considered a soft drink if it's alcohol-free?
Generally, yes — alcohol-free beer typically falls under 0.5% ABV, which usually meets the threshold to be classified as non-alcoholic, placing it within the broader soft drink category despite its beer-style flavour.
Did Joseph Priestley set out to invent a drink?
No, he was studying gases produced during fermentation at a brewery near his home. Carbonated water was a genuine byproduct of that research, not the original goal.
Is tonic water technically a soft drink?
Yes, tonic water is classified as a soft drink — it's non-alcoholic, carbonated, and flavoured, even though it's most commonly consumed as a mixer alongside spirits like gin.
Why do some soft drinks contain caffeine if they're not coffee or tea?
Caffeine is added deliberately to certain colas and energy-style soft drinks for its stimulant effect, independent of tea or coffee — it's simply an ingredient manufacturers choose to include, much like a flavouring or sweetener.
Are "cordial" and "squash" the same thing?
They're very similar and often used interchangeably in the UK — both refer to a concentrated fruit-flavoured syrup that's diluted with water before drinking, rather than a ready-to-drink product.
Is sparkling mineral water a soft drink?
This is somewhat debated — plain sparkling water with no added flavouring or sugar sits closer to a hydration product than a traditional soft drink, though it's often stocked alongside soft drinks in shops for convenience.
