Rice has a moisture content that comes out when microwaved. Lots of people dampen the rice bag before heating so you get a moist heat which is soothing for chest colds and sore muscles.
Rice is made to cook in water, so the heat makes a little "oven" in their. Barley is way better. This is just some of what google gives you. I hope this helps. PBP
https://www.google.com/search?sourc ... nUS306US308&q=making+barley+bags
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Using Rice Filled Bags for Back Pain