local myPart = Instance.new("Part")
local i = 1
while i < 10 do
myPart.Parent = game.Workspace
myPart.Size = Vector3.new(10, 10, 10)
myPart.Anchored = false
i++
end

local myMass = myPart:GetMass()

print("My part's mass is " .. myMass)