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FIG 1
How a kettle clicks itself off
Click the steps, or press →
1.7 L
SSSS…
SWITCH
CUTAWAY: steam tube + strip
steam in
bimetallic strip
CLICK!
WATER
base
25°
60°
100°
25°C
STEAM
none
SWITCH
OFF
Big idea: steam, not a timer, switches the kettle off — hot steam bends the strip, and the strip trips the switch.