Wikipedia:Reference desk/Archives/Science/2021 October 3
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October 3[edit]
Do plants sleep under UV lamps?[edit]
Some botanists try to grow plants under UV lamps. At night time, does this plants sleep under those lamps or stay awake all the time? Sleeping means this oneRizosome (talk) 00:30, 3 October 2021 (UTC)
- I'm going to guess not. Think marijuana farms. Imagine Reason (talk) 11:50, 3 October 2021 (UTC)
- Maybe not a Reliable Source, but see Do plants sleep under ultaviolent rays?. A lot of other web sources are related to cannabis cultivation. Alansplodge (talk) 21:14, 3 October 2021 (UTC)
Relative volatility for ternary mixtures[edit]
What algebraic expression has the extension of the definition of relative volatility for ternary mixtures? Thanks!--178.138.98.154 (talk) 09:58, 3 October 2021 (UTC)
- Raoult's law is written in terms of vapor pressure, but I think it can be pressed into service here. --Jayron32 20:46, 4 October 2021 (UTC)
Are N95 disposable respirators thicker than KN-95 ones?[edit]
I've tried a number of KN-95 respirators of various provenance. They seem to be of similar build and feel, and no one who've used them have been infected yet, so I assume they're decent. But they are relatively thin. I look at the 3M and Honeywell N95 respirators, with and without valves, and their layers seem more distinct, and thicker in total. I haven't seen anyone discuss this difference. Any ideas? Imagine Reason (talk) 22:41, 3 October 2021 (UTC)
- The table on this page discusses the differences between the various standards (N95, KN95, P2, FFP2, etc.) I don't see "thickness" as part of any of the standards; N95 ones apparently are little bit more "breathable" than KN95. --jpgordon𝄢𝄆𝄐𝄇 15:49, 5 October 2021 (UTC)
- It's definitely not something that's discussed. I'm just curious because it seems obvious when you hold them side by side. Imagine Reason (talk) 15:08, 7 October 2021 (UTC)