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🍬 Sugar stages: candy thermometer

The thermometer is watching water leave. Thread, ball, and crack are names for the structure your syrup will have when it cools.

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

  1. A syrup is a changing solutionConnect boiling, evaporation, concentration, and boiling-point elevation.Sugar stages are concentration landmarks: as water leaves, the syrup boils hotter and cools into a different structure.
  2. Balls are concentration made visibleUse cold-water tests and crystal control to distinguish ball stages and explain fudge texture.Ball stages describe cooled pliability, while cooling and agitation determine whether a candy becomes smooth or grainy.
  3. Crack stages make glassy candyDistinguish soft crack, hard crack, moisture, and caramelisation without treating temperature charts as recipes.Crack stages are low-moisture endpoints; the texture changes from flexible strands to brittle glass, while browning is a separate chemistry.
  4. Make the reading honestCalibrate a candy thermometer, adjust for altitude, and design a useful cold-water observation.A trustworthy stage reading combines a calibrated instrument, local conditions, and the cooled sample’s actual texture.

Questions this course answers

Why does a sugar syrup’s temperature rise as it boils?

Boiling removes water and concentrates the nonvolatile sugar, so the solution’s boiling temperature rises.

Match each stage to its cooled texture

The names describe what a cooled syrup sample does, not how the hot syrup feels in the pan.

What primarily distinguishes hard crack from soft crack?

Hard crack is a drier endpoint that produces brittle candy, while soft crack leaves enough moisture for flexible strands.

If boiling water reads 205°F instead of 212°F, how much should a 240°F target be shifted?

The thermometer is seven degrees below the sea-level reference, so subtract seven degrees from the printed target.

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