Liquid water changes to vapor,which is called evaporation..谁可以帮我解释下状语,

问题描述:

Liquid water changes to vapor,which is called evaporation..谁可以帮我解释下状语,
里非限定定语从句是做状语吧?那他做什么状语?

液态水变成水蒸气就叫做蒸发.