A single item.
a quantity of a dolphin is 1 the quantity of two dolphins is 2
1 mole is itself, a quantity. But, if you like, the quantity is 6.022140857*10^23 atoms of fluorine.
If you look at a product listing on eBay and see the sentence " 1 quantity" or " Quantity:1" that means that the seller has only one of that item. Or, if you saw a product listing that said " Quantity:10" that would mean that the seller had ten of that item. And if it says "Quantity: 10+" it means the seller has ten or more of that item.
When the numerical value of a quantity is equal to the unit of that quantity, it means that the quantity being measured is equal to 1 in that unit. This often simplifies calculations and conversions in physics and mathematics.
Multiply the quantity by .2 or divide the quantity by 5. Either method will yield 1/5 of that quantity.
Quantity x+4 times quantity x+1.
An example quantity of time could be 1 hour or 30 minutes.
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The ratio of 15 to 1 can be expressed as 15:1. This means that for every 15 units of one quantity, there is 1 unit of another quantity. It indicates a relationship where one quantity is fifteen times larger than the other. This ratio can also be simplified to a fraction, which is 15/1, equal to 15.
"1 cubic meter" is a perfectly good 'quantity'. If the 'quantity' you want is the weight instead, then you need to know a unit weight or density for sand, in order to convert a volume to a weight.
1 x 1 = 1 That is, if you have a quantity of one number 1, you have one of them.