finf nearest meaning of yielding hard.soft.hot.vold
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JULIA GREENBERG12.26.14 6:30 AM
SCIENCE
The Chemical Reactions That Make Hand Warmers Heat Up
What's inside Hothands Super Warmers?
Bryan Edwards
IRON POWDER
Oxygen in the air reacts with this powder to yield iron oxide—rust—and heat. These hotties can reach up to 163 degrees Fahrenheit; military-grade warmers (for heating MREs) can get to upwards of 200 degrees. Manufacturers produce iron powder by either crushing iron or spraying a molten stream with water. Fun fact: We eat about 2 million pounds of iron powder each year in our favorite (fortified) breakfast cereals. Yum!
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