Edna: [on Jack-Jack's suit] I cut it a little roomy for the free movement, the fabric is comfortable for sensitive skin... [a sheet of flame erupts in front of the suit] Edna: And it can also withstand a temperature of over 1000 degrees.
a typical hot pack is designed to reach a temperature of approximately 50 degrees Celsius starting from room temperature at about 20 degrees Celsius.Assume that the hot pack will contain 100.0 mL of water. typical hot pack is designed to reach a temperature of approximately 50 degrees Celsius starting from room temperature at about 20 degrees Celsius.
As the salt disassociates, heat is either released in an exothermic reaction or absorbed in an endothermic reaction. Commercial instant cold packs typically use either ammonium nitrate or urea as their salt component; hot packs often use magnesium sulfate or calcium chloride. These reactions happen in a similar manner.