# Looking for a safe exothermic reaction [closed]

Is there an exothermic reaction which produces 1 to 2 minutes of heat at around 175 degrees Fahrenheit, no toxic gasses and is considered to be more or less safe?

• Safe is a matter of scale. The reactions mentioned in the other answers are all "safe" on small scales, say less than 100 mL or 100 g. What are you planning on heating? How big is it? – Ben Norris Oct 20 '12 at 12:36

• "Ammonium chloride" and "sodium nitrite" are actually aqueous solutions of those salts. The reaction is $$NH_4Cl + NaNO_2 --> N_2 + 2H_2O + NaCl$$. – Fausto Arinos Barbuto Jun 10 '16 at 3:09