Containment, normally expressed as a percentage, indicates how much of the fire has been enclosed by a control line. A wildfire with 25% containment means control lines have been completed around 25% of the fire's perimeter.
Controlled fires are not only contained but have been burned out along the interior of the control line with any hot spots threatening the line cooled down. The control lines are expected to halt the spread of the fire under reasonable conditions.
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