Given the task definition and input, reply with output. In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.

Question: John was weighing some materials in his science lab. He observed that as objects had lower density, the heaviness of the objects 
 Answer: Decreased

A given volume of a denser substance is heavier than the same volume of a less dense substance.