A quick and easy tool for demonstrating thermal properties of matter. Bar is bi-metallic and has a wooden handle attached. Our bimetal strip is thin and is made of two alloys, a high expansion component with 75% manganese, 15% nickel, and 10% copper, and a low expansion component with 64% iron and 36% nickel. It responds quickly to heat; a Bunsen burner can be used as a heat source but is not required. Includes activity guide.