Except where otherwise noted, textbooks on this site The calibration is accomplished using a reaction with a known q, such as a measured quantity of benzoic acid ignited by a spark from a nickel fuse wire that is weighed before and after the reaction. If you examine your sources of information, you may find they differ slightly from the values I use. Note how the gram and C units cancel algebraically, leaving only the calorie unit, which is a unit of heat. When working or playing outdoors on a cold day, you might use a hand warmer to warm your hands (Figure 5.15). stream Which takes more energy to heat up: air or water? C 2 A common reusable hand warmer contains a supersaturated solution of NaC2H3O2 (sodium acetate) and a metal disc. Lubrication Data Apps