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A kind of starch · also called Corn starch, Cornflour, Maize starch

4 views: its portrait, and how it looks in the comparison photos.
About
Cornstarch is a fine, airy powder milled from corn kernels that takes up twice the volume of water by weight.
Cornstarch is a fine starch powder extracted from the endosperm of corn kernels. It has a bulk density of about 4.2 ounces per US cup (0.5 g/mL), meaning it takes up twice the space of water for the same weight. Because it traps air between its microscopic particles, it is noticeably lighter by volume than granulated sugar or table salt.
From Wikipedia
Corn starch or cornstarch, cornflour is the starch powder derived from corn grain. The starch is obtained from the endosperm of the kernel.
Read more on Wikipedia →Text from Wikipedia’s “Corn starch” article, CC BY-SA 4.0.
3 on the site
One cup weighs
4.17 oz (118 g)
Quick answer
One US cup of cornstarch weighs about 4.2 ounces (118 g). That makes it roughly half as heavy as the same volume of water.
Typical figures, the same ones every comparison on the site uses; real ones vary.
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Next to anything: a person, a car, another starch.