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 0.810 times the weight of a Paper Clip, and the weight of a Paper Clip is 1.20 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.
It's about three-fifths as heavy as a Playing Card.
In other words, 0.04 ounces is 0.630 times the weight of a Playing Card, and the weight of a Playing Card is 1.60 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 0.450 times the weight of a Penny, and the weight of a Penny is 2.20 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 0.280 times the weight of a Die (Dice), and the weight of a Die (Dice) is 3.60 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-fifth as heavy as a Quarter.
In other words, the weight of a Quarter is 5 times 0.04 ounces.(United States quarter-dollar coin) (a.k.a. Quarter dollar, a.k.a. America the Beautiful quarter, a.k.a. two bits)
The America the Beautiful series quarters, which began to enter circulation in 2017, weigh 0.20 ounces each. In answer to the common riddle, there are 119 ridges around the edge of the coin in its current design.