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.
1 You'll need to fill in the dates from the pennies you're using. 2  Using your balance scale, determine the mass of each penny in grams to the hundredths place, starting with the oldest and working up to the newest. 3  Calculate the average mass of one penny and record the mass on your data chart.