what is 2.5% vapor expressed in parts per million?

As a vapor, I would think you mean 2.5 cc/100 cc = 2.50%

Multiply both numerator and denominator by a factor to convert to any unit you wish. For example,
2.5/100 = (2.5/100) x (10/10) = 250/1000 or 250 parts per thousand.

To convert a percentage to parts per million (ppm), you can use the following formula:

ppm = (percentage/100) x 1,000,000

Using this formula, we can calculate the value of 2.5% vapor in parts per million:

ppm = (2.5/100) x 1,000,000
= 0.025 x 1,000,000
= 25,000 ppm

So, 2.5% vapor is equal to 25,000 parts per million (ppm).

To express 2.5% vapor in parts per million (ppm), we need to convert the percentage into a ratio or fraction.

First, let's understand what parts per million means. Parts per million is a unit of measurement that represents the concentration of a substance in a solution. It indicates the number of parts of a particular substance present in one million parts of the solution.

To convert a percentage to a parts per million value, we can use the following formula:

Parts per million (ppm) = (Percentage / 100) * 1,000,000

Now let's apply this formula to the given value:

2.5% expressed as a decimal is 0.025, so:

ppm = (0.025 / 100) * 1,000,000
= 25,000 ppm

Therefore, 2.5% vapor is equivalent to 25,000 parts per million.