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The representation is made on a temperature-relative humidity, instead of a standard psychrometric chart. The comfort zone in blue represents the 90% of acceptability, which means the conditions between -0.5 and +0.5 PMV, or PPD < 10%.
Relative humidity should be maintained at 30–50% without cycling more than +/- 5% a day. [7] The lower part of that range is best for "long term stability of several photographic processes". [ 12 ] Not only do relative humidity levels above 60% cause deterioration, but also low and fluctuating humidity may also damage them.
For example, according to the heat index, a relative humidity of 75% at air temperature of 80.0 °F (26.7 °C) would feel like 83.6 ± 1.3 °F (28.7 ± 0.7 °C). [13] [14] Relative humidity is also a key metric used to evaluate when it is appropriate to install flooring over a concrete slab. [clarification needed]
The humidity adjustment approximately amounts to one Fahrenheit degree for every millibar by which the partial pressure of water in the atmosphere exceeds 10 millibars (10 hPa). At the time the humidex was originally developed in 1965, Canada was still on the Fahrenheit scale , and thus the humidex was originally based on that.
A moisture meter gives a reading of the approximate moisture content of wood. The reading helps in determining whether the wood is suitably dry for its intended purpose. The moisture content reading can also assist in planning a project design that will accommodate future changes in dimension caused by changes in relative humidity.
Image credits: chron0john #2. Under cabinet lighting. Cost me $150 and was 1000% worth it. DIY fire pit was about $50 worth of retaining wall blocks, also completely worth it.
After a summer full of grilled zucchini and yellow squash, now is the perfect time to switch things up and cook some winter squash. So what exactly sets summer and winter squash varieties apart?
The conditions under which the measurement is made has a considerable influence on the result. Both the temperature and humidity gradients across the sample need to be measured, controlled and recorded with the result, and the thickness of the sample should be the same. An MVTR result without specifying these conditions is almost meaningless.