It's about as heavy as a Jelly Bean
It's about four-fifths as heavy as a Paper Clip
In other words, 0.04 ounces is 0.81 times the weight of a Paper Clip, and the weight of a Paper Clip is 1.2 times that amount.(average)
Notwithstanding the tremendous variation in sizes and materials, a typical paperclip weighs about 0.049 ounces. The country of Norway has used the paper clip as something of a national symbol since the end of World War II based on the erroneous notion that the paperclip was invented by a Norwegian, Johan Vaaler. However, the paperclip had already been in existence for at least 30 years by the time of Vaaler patented his paperclip design.
It's about one-and-two-fifths times as heavy as a Nail
In other words, 0.04 ounces is 1.4 times the weight of a Nail, and the weight of a Nail is 0.71 times that amount.(for 15-gauge, 2-inch, finishing nails)
A two-inch finishing nail weighs 0.028 ounces. Nails have been in use for more than 5,400 years and were ven used as a medium of exchange in ancient times.
It's about three-fifths as heavy as a Playing Card
In other words, 0.04 ounces is 0.63 times the weight of a Playing Card, and the weight of a Playing Card is 1.6 times that amount.(ISO 216 B8 size, 2.5" x 3.5")
A single ISO 216 B8-size playing card weighs 0.063 ounces. Although this size is the most common home playing card, many casinos use "bridge size" cards — 2,640 sq. mm (4.036 sq. in) smaller in area.
It's about half as heavy as a Penny
In other words, 0.04 ounces is 0.45 times the weight of a Penny, and the weight of a Penny is 2.2 times that amount.(United States) (formally one-cent coin) (Union shield design, 2010-present)
The weight of a United States penny is 0.088 ounces. According to a 2010 report by the United States Mint, the cost of manufacturing and distributing a penny is $0.0179 — more than its face-value.
It's about three-tenths as heavy as a Die (Dice)
In other words, 0.04 ounces is 0.28 times the weight of a Die (Dice), and the weight of a Die (Dice) is 3.6 times that amount.(for six-sided, 16 mm, rounded cube)
A die, of the size most commonly used in board games and casinos, typically weight 0.140 ounces. The use of dice and dice-like tools predates written history, with the oldest known examples belonging to a 5,000-year old backgammon set uncovered during an archaeological dig in modern-day Iran.
It's about one-fourth as heavy as a sheet of Paper
In other words, 0.04 ounces is 0.23 times the weight of a sheet of Paper, and the weight of a sheet of Paper is 4.3 times that amount.(for US Letter, a.k.a. ANSI A; 215.9mm by 279.4mm (8.5 in x 11 in); 20lb)
The weight of a ream (500 sheets) of 320 ounces, 8.5 inch x 11 inch paper is 71 ounces, each sheet weighing 0.180 ounces. Paper of this size has a thickness of 0.004 caliper (0.1 mm).