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Book 9, Question 60 · Video

Why Does Steam Help Some Bread Crusts?

Video · 1:55 · Crafty Clover explains, from A Million Whys Book 9

Steam helps some bread crusts because it keeps the outside flexible while the loaf expands! Later, the steam dries away and the crust turns into a crisp, shiny shell. Bakery ovens

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What Crafty Clover says in this video

Intro

Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. Why does steam help some bread crusts?

The Big Idea

Steam helps some bread crusts because it keeps the outside flexible while the loaf expands! Later, the steam dries away and the crust turns into a crisp, shiny shell. Bakery ovens add steam on purpose.

Steam Arrives

Step one: steam coats the loaf. When a loaf goes into a steamy oven, water vapor settles on its cool surface. That keeps the outside moist and soft for a little longer, so the loaf has time to grow.

Loaf Expands

Step two: the loaf grows taller. A soft crust can stretch as gases expand, so the bread rises higher. Without steam, the crust sets early and holds the loaf back.

Crisp Shell

Step three: the crust turns crisp. The moisture makes starch on the surface turn into a thin gel, which bakes into a glossy, crackly shell. Once the steam is gone, the crust dries and crisps.

A Closer Look

Let's take a closer look! Steam fills the oven at the start. The crust stays soft and flexible. The loaf springs up tall. Then the crust dries into a crisp shell.

Quick Facts

Quick facts! Professional bakery ovens have steam injectors. Home bakers use pans of hot water or covered pots to copy that steam. Steam makes a crust shinier and crunchier, and it can give it a beautiful golden color. Steam burns skin, so kids stay back, and grown-ups use oven mitts.

Think Like a Scientist

Now, think like a scientist! Watch a grown-up add a small pan of hot water to a hot oven. Kids stay back, because steam burns. Notice how the crust looks after baking. Is it shiny and crisp?

Outro

Steam is crust coaching. Science is amazing! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!

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