90g
That will depend on the size of the ruler and what it is made out of. A plastic or wooden ruler will be very light, maybe an ounce. A steel ruler will weigh much more.
It depends on what the ruler's made out of. A plastic ruler would inevitably weigh less than a steel ruler.
a ruler weighs 19 grams
20g
Like an ounce
Its Weighs 2.5 Pounds If U Have A Ruler It'll Show it
1
It really depends there are SO MUCH rulers out there and there are a lot of different kinds so it's really hard to tell you because they weigh different.
3 pounds
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use a triple beam balance
A wooden ruler weighs about 1/3 of an oz. It varies with manufacturer, some are .29 oz, but a rough estimate is 1/3 oz.