If something is still hot when weighed, will it's mass be more or less than if weighed at room temperature?

Question

Ok, so for this lab, we had to dry some silver chloride in a Goch crucible in an oven. Then we were supposed to take it out of the oven, and make sure to let the crucible and silver chloride cool before weighing it. One of the follow-up questions for the lab is if the crucible and silver chloride were weighed while still hot, would the percent yield of silver from the original alloy be higher or lower than the true value and why (we were given an alloy with silver, and we extracted the silver into silver chloride, so that we weigh the silver chloride and use calculations to figure out the amount of silver present in the original alloy). Basically I'm pretty sure the question means if the weight of the crucible and silver chloride will be more or less than at room temperature and why, because this is what would affect the percent yield in the calculations.

Answer 1

Hot objects on a balance give off a column of hot, rising air which is less dense than ordinary air. So there is less air pushing down on a hot object on a balance, so its apparent mass is a bit lighter than it should be.