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🌡️ Why your oven lies: hot spots, calibration

The dial said 350. The cookies did not. The air, the walls and the stone are three different temperatures, and only one of them is where dinner sits.

3
lessons
~10 min
to learn
🔬 Science
subject
Adults
level
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What you’ll learn

  1. The number on the door is a rumourTreat the set temperature as a cycling average, measure the offset at the middle of the middle rack, and stop trusting the beep.Thermostats hunt. ATK allows a 25°F swing. ThermoWorks' min/max average is the number you actually cook with.
  2. The box is not one temperatureMap hot spots to the periphery, use King Arthur's toast test, and read López-Alt's rack-height numbers as radiation falling off with distance.Hottest at top, bottom and sides. Floor stone ~680°F, top stone ~560°F. Rotate, or put the pan where the job is.
  3. Air is a liar. Mass is not.Separate air temperature from thermal mass, and see why steel can be cooler than stone and still cook faster.Preheat the mass, not the chime. Stone blurs the floor hot spot. Steel conducts. Tonight, toast a loaf and ask which lie baked the cake.

Questions this course answers

Why can a well-calibrated oven set to 350°F still wander well above and below that number?

ThermoWorks: the thermostat cuts power when the sensor thinks the box is at temperature, then wakes the element when the air cools. America's Test Kitchen: a well-calibrated oven can still swing 25°F either side.

How far may a certified oven swing and still be called accurate on average?

ATK: ovens can fluctuate within 25 degrees of the target and still be considered accurate on average, as NSF International acknowledges. The problem is when the average itself is 25 degrees off.

Match each place in the oven to what King Arthur or López-Alt measured there

King Arthur: hottest at top, bottom and sides. López-Alt: floor stone ~680°F, top stone ~560°F, air ~560°F.

In López-Alt's pizza-lab test, about how hot was the stone sitting on the oven floor after 45 minutes, while the air was about 560°F?

On the floor the stone reached nearly 680°F. Radiation from the metal floor, falling off with the square of distance, is why the same stone was only about 560°F on the top rack.

Put King Arthur's toast-test in the order that actually maps your hot spots

Hamel: the beep is a liar; her oven needs thirty minutes, not fifteen. Centre slices are the control. Edge slices name the hot spots.

In your own words, why can a baking steel be cooler than a stone in the same oven and still brown a pizza faster?

López-Alt: the steel often sat at 450–500°F against a stone at 500–525°F, yet finished a New York pie in six minutes instead of eight. Conductivity, not the infrared reading, decided the crust.

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