Liquefy often involves heat to transition solid items to liquid form. The intense heat will liquefy the wax quickly.
Pro Tip 2/3
Natural Processes
Liquefy can also refer to natural melting without direct human intervention. The sun will eventually liquefy the hailstones on the sidewalk.
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Not Dissolving
Liquefying doesn't mean dissolving into another substance; it becomes liquid while remaining pure. If you liquefy raw sugar, you'll get liquid sugar, not syrup.