Practice question · True or false
A sealed hollow form can be fired safely without a vent hole if it is dried thoroughly first.
Hints
- Ask what happens to any remaining moisture and to the air inside.
- Trapped air expands and steam has nowhere to go.
Show the answer
False
Why
False, and it is a standard workshop accident. Even a thoroughly dried form contains air that expands on heating, and any residual moisture becomes steam with nowhere to escape. A vent hole costs nothing and prevents the piece, and sometimes its neighbours in the kiln, from being destroyed.
Practise Clay: What It Is and Why It Shrinks
The app has 5 more questions on this lesson, and keeps your place in the course. Sculpture I is free to start.
More questions on Clay: What It Is and Why It Shrinks
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