 oil is produced in the physical numbers between cold milk and oil & gas is trapped in the container & if gases are released by a chemical reaction then the total mass of the product will be less than the total mass of the reactants -> the mass of the final product of the baking soda and vinegar will not be less than the mass of the reactants the mass of the final product of the baking soda and vinegar will not be less than the mass of the reactants