Take our 100 x 100 pixel image again. Suppose it's set at 100 PPI (producing the same 1 x 1 printed image). With re-sampling off, when you adjust the PPI the dimensions adjust as well, this is how things worked in the example above. With re-sampling on, the dimensions won't change.
To dispose of charcoal and wood ash: Let the ash cool for 48 hours. You can speed up this process by pouring water over the hot charcoal and stirring it very carefully. When the ash has cooled completely, wrap it in aluminum foil and place it in an noncombustible outdoor trash bin.
You will see warnings on various fire department Summer Safety Tips webpages that say if you have a bag of wet charcoal you should discard it, keep it in a well-ventilated area or dry it out in a well-ventilated area. Most of these web pages don't explain why they warn you about storing wet charcoal.