Mass, Volume, and Density

1. Which of the following properties of an object might change with temperature: mass, volume, density? Explain your answer briefly. 2. The volume of a metal rod was determined to be 38.6mL. Its mas was found to be 400.3g when measured on a simple balance. Would measuring the mass on a digital balance improve the accuracy of the density determined? Justify your answer on the basis of the rules pertaining to the use of significant digits