A $1bill weighs approximately...?(state weight of $1 bill.) So the weight of the national debt in $1 bill would be...(state weight of debt.) this is approximately... (make comparison to Some object.)

https://www.google.com/search?source=hp&ei=nYLVXb2XFpDYsAXt05VI&q=weight+of+%241+bill&oq=weight+of+%241+bill&gs_l=psy-ab.3..33i22i29i30l9.2356.2356..4121...0.0..0.181.181.0j1......0....2j1..gws-wiz.wSINcZqy4nE&ved=0ahUKEwj92ZbCsvnlAhUQLKwKHe1pBQkQ4dUDCAg&uact=5