A great project idea for teaching insulators and conductors for my science 7 unit on heat and temperature. I had them make their own thermos' and the one that kept boiling water the hottest won a prize!! I also test with ice water too.
OT Thermos Food Jar: Perfect for lunch bags or picnics, this durable food jar does an incredible job of keeping your food hot or cold. Although small enough for easy transporting, it’s big on convenience. Holds 10 oz. of food, TherMax® double-wall vacuum insulation helps retain temperature, keeps food hot (5 hours) or cold (7 hours), 3.5 W x 3.5 D x 4.5 H, with extra-wide mouth for easy filling, serving & cleaning (hand wash only). $22.50
OT Thermos: This large, eco-friendly bottle keeps 34 ounces of your liquid hot or cold. And with its vacuum insulation, the temperature stays constant for even longer. TherMax® double-wall vacuum insulation helps retain temperature. Keeps beverages hot or cold for 24 hours in convenient twist & pour stopper for easy serving. 4.3 W x 4.2 D x 12.3 H, unbreakable 18/8 stainless steel interior & exterior. Hand wash only. $36
After the brewing of your coffee or tea is complete, simply pour the liquid into the Ember. The mug features a rotating base that allows you to immediately adjust the temperature of the liquid. You have the option of cooling it down and warming it up.