It depends on what the ruler's made out of.
A plastic ruler would inevitably weigh less than a steel ruler.
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you would weigh it by using grams
A standard ruler typically weighs around 5 to 10 grams, depending on the material it is made of (e.g. plastic, wood, metal). To convert grams to kilograms, you divide by 1000, so a ruler would weigh approximately 0.005 to 0.01 kilograms.
grams
well you have to think you would weigh this using grams so the density of a foam block is "Grams per cubic centimeters"
A pen would weigh approximately 10 grams. 100 grams would be about 100 grams of feathers.