It's about nine-tenths as heavy as a Raindrop
In other words, the weight of a Raindrop is 1 times 0.0004 pounds.(a.k.a. drop, a.k.a. droplet) (average)
The weight of a raindrop depends heavily on the type of weather, but averages about 0.0004 pounds. The familiar teardrop shape of a raindrop is actually an optical illusion, caused by the reflection of the light and the motion of the drop.
It's about one-fourth as heavy as a Nail
In other words, 0.0004 pounds is 0.230 times the weight of a Nail, and the weight of a Nail is 4.30 times that amount.(for 15-gauge, 2-inch, finishing nails)
A two-inch finishing nail weighs 0.0017 pounds. 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 one-fifth as heavy as a Jelly Bean
In other words, 0.0004 pounds is 0.160 times the weight of a Jelly Bean, and the weight of a Jelly Bean is 6.30 times that amount.(for Jelly Belly beans; approximate)
Made of sugar, corn syrup, and pectin, a single jelly bean weighs about 0.0025 pounds. President Ronald Reagan cited jelly beans as his favorite candy and 7,000 lbs of the candies were served at his first inauguration in 1981.
It's about six-and-a-half times as heavy as a Grain of Rice
In other words, the weight of a Grain of Rice is 0.160 times 0.0004 pounds.(long grain; 14% moisture content)
A single long grain of rice weighs an average of 0.0000640 pounds. A staple through most of human history, archaeological evidence indicates that the earliest rice cultivation was about 11,500 years ago.
It's about one-tenth as heavy as a Paper Clip
In other words, 0.0004 pounds is 0.130 times the weight of a Paper Clip, and the weight of a Paper Clip is 7.70 times that amount.(average)
Notwithstanding the tremendous variation in sizes and materials, a typical paperclip weighs about 0.0031 pounds. 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-tenth as heavy as a Playing Card
In other words, the weight of a Playing Card is 10 times 0.0004 pounds.(ISO 216 B8 size, 2.5" x 3.5")
A single ISO 216 B8-size playing card weighs 0.004 pounds. 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 one-fifteenth as heavy as a Penny
In other words, the weight of a Penny is 14 times 0.0004 pounds.(United States) (formally one-cent coin) (Union shield design, 2010-present)
The weight of a United States penny is 0.0055 pounds. 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.