The melting point of zirconium (1855 degrees Celsius) is a physical property. Here's why:

* Physical properties are characteristics of a substance that can be observed or measured without changing the substance's chemical composition. These properties describe the substance's appearance, texture, and behavior.

* Chemical properties describe how a substance reacts with other substances, resulting in a change in its chemical composition.

Melting is a physical change because it doesn't alter the chemical makeup of zirconium. It only changes its state from solid to liquid.