Water Resources and Environment. The jurisdiction of the Subcommittee on Water Resources and Environment consists generally of matters relating to water resources development, conservation and management, water pollution control and water infrastructure, and hazardous waste cleanup.
A pennyweight (abbreviated dwt) is a unit of mass that is equal to 24 grains, 1â20 of a troy ounce, 1â240 of a troy pound, approximately 0.054857 avoirdupois ounce and exactly 1.55517384 grams.
In the Middle Ages, a British penny 's weight was literally, as well as monetarily, 1â20 of an ounce and 1â240 of a pound of sterling silver. At that time, the pound in use was the Tower pound (5,400 troy grains).The medieval English pennyweight was thus equal to 32 Tower grains (also known as wheat grains).hen Troy weights replaced Tower weights in 1527, the Troy weights were defined in such a way that the old Tower pound came out to exactly 5400 Troy grains (also known as barleycorns), the Tower pennyweight 22 1â2 Troy grains (and thus approximately 1.46 grams).