How do I verbally say 2.1 ng/kg - eviltoast

I know the ng means nanogram

But I’m curious how would I say the above line of 2.1 ng/kg

For context I got it from this paragraph

a lethal dose of 1.3–2.1 ng/kg in humans

Would it be

2.1 nanogram per kilogram?

Also if I wanted to write that as a decimal number how would i write that?

  • Ephera@lemmy.ml
    1·
    5 months ago

    Well, what I meant with that, is that it’s semantically important that it’s ng of the substance per kg bodyweight.

    If it was ng of the substance per kg of the substance, then in proper mathematical physics, the unit would disappear completely.

    So, for example:
    42000000000 ng of the substance / kg of the substance

    Is equivalent to:
    42000000000 * 0.000000001 * kg of the substance / kg of the substance

    Which means in the end, you just have: 42

    As my physics teacher would often say: Is that 42 potatoes or sausages or what is it?
    A number without a unit is just devoid of meaning…