<prompt> Average particle size of powdered gold is:10 μm15 μm30 μm0.1 mm  <response>: A fine powder is formed by chemical precipitation or by atomizing the metal. The particle sizes vary average 15 μm. The pellets are mixed with soft wax 0.01 organic wax, which is burnt off prior to use and then wrapped with gold foil No. 3, rather than sintering the mass, like for mat gold.Ref: Basic Dental Materials 4th ed page no 160 