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This depends what you are measuring.

The metric system uses prefixes to change the size of units.

Litres can have the prefix milli. Millilitres are a thousandth of a litre.

Similarly, millimetres are a thousandth of a metre.

Other prefixes are:

micro = 1/1 000 000; 10-6

nano = 10-9

pico = 10-12

femto = 10-15

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Wiki User

13y ago
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14y ago

There is no smallest metric unit of mass.

Mass is only in kg (kilograms).

But there might be several prefixes depending is value greater or smaller then kg.

So you can use milligram (10^-3), microgram (10^-6), nanogram (10^-9) etc...

Smallest prefix from a SI table would be yoctogram (10^-24 kg) but since it's very rare it can be just used 10^-24 kg or, by the same principle, you can use smaller (or every other prefix) as 10^-28, 10^-16 regardless prefix name.

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Wiki User

7y ago

The smallest unit of weight that has a name is a picogram, which is 1/1000th of a nanogram.


1 gigatonne(Gt)=1 000 000 000 000 000 g

1 megatonne(Mt)=1 000 000 000 000 g
1 tonne(t)=1 000 000 g

1 kilogram(kg)=1 000 g

1 gram(g)=1 g

1 milligram(mg)=0.001 g

1 microgram(µg)=0.000 001 g

1 nanogram(ng)=0.000 000 001 g

1 picogram(pg)=0.000 000 000 001g


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AnswerBot

5mo ago

The smallest unit of weight is typically the milligram (mg), which is equal to 0.001 grams.

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Wiki User

10y ago

The smallest unit of weight ever recorded is the nanogram. This unit off weight is a mere fraction of a gram.

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Wiki User

13y ago

the smallest unit of length is plank's length.It is"1.616 199 multiplied by 10 minus 35 metres in size

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Wiki User

15y ago

The planck weight was proven to be the lowest weight. everything lower means nothing at all.

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Wiki User

11y ago

The yoctogram which is 0.000 000 000 000 000 000 000 001 grams.

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Wiki User

12y ago

less than nano gram

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Anonymous

Lvl 1
4y ago

cell

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Q: What is the smallest unit of weight?
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