You could measure the length or width of it but you would have a decimal. You should be using centimeters.
This is not a valid conversion. Square mm is a measure of area. Cubic mm is a measure of volume.
To measure the mm of an item you would need to use a metric ruler. The metric ruler has cm and mm on it.
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Micrometer to measure the accuracy of 0.01 mm. Caliper to measure with accuracy of 0.1 mm is used.
I used millimeters (mm) as the standard unit of length to measure the paperclip.
A standard paperclip typically measures about 25mm in length.
A jumbo paperclip typically has a thickness of around 2.5 mm.
cm mm
Grams
There are different sizes: commonly around 7 mm.
You would typically use grams or milligrams to measure the weight of a paperclip because they are very light objects.
No, a paperclip typically weighs less than a gram, not 3 kilograms.
You could measure the length or width of it but you would have a decimal. You should be using centimeters.
A ruler is used to measure length and does not account for the height or width of an object, which are necessary to calculate its volume. To find the volume of a paperclip, you need to measure its dimensions in three dimensions using a tool such as a caliper or by using a water displacement method.
Laugh out loud
This is not a valid conversion. Square mm is a measure of area. Cubic mm is a measure of volume.