Heat Conductivity App. With Thermometer - Set of 4This Heat Conductivity Apparatus includes four metal bars steel, brass, aluminium, and copper each designed to demonstrate varying rates of thermal conductivity. When placed in hot water, each metal bar conducts heat at a different speed, easily observable using the included liquid crystal thermometers. Housed in a compact plastic unit, the set is a safe and effective way to introduce comparative thermal conduction without open flames. Perfect for