Decades: 1170s 1180s 1190s 1200s 1210s - 1220s - 1230s 1240s 1250s 1260s 1270s
Years: 1215 1216 1217 1218 1219 - 1220 - 1221 1222 1223 1224 1225
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... amount of energy can be supplied in abundance. As the quantity of energy put into the flame is known, and the quantity remaining at the other side (at the detector) can be ...