Definition. A metric space is a set X together with a function d (called a metric or distance function) which assigns a real number d (x, y) to every pair x, y X satisfying the properties (or axioms): 1  d (x, y) 0 and d (x, y) = 0 x = y, 2  d (x, y) = d (y, x),
Here are some facts and guidelines about formaldehyde in plywood and OSB that can help you when building a chicken coop: 1  Formaldehyde is used in the binders and resins of some manufactured wood products. 2  Offgassing can be an issue with products containing urea-formaldehyde (UF) resins.
Formaldehyde is a common contaminant in indoor air as it outgases from fabricated wood products, paints, adhesives, fabrics etc. It is toxic and the Occupational Safety & Health Administration (OSHA) guideline for formaldehyde exposure is less than 750 ppb (0.75 parts-per-million (ppm)) over an 8-hour period.ver time a steady state level of formaldehyde is reached that is based on a variety of variables including the output of the hydroxyl generator, concentration of the influx of VOCâs, ambient formaldehyde levels, room ventilation rate, humidity, system fan speed, etc..