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Thanks for contributing, Roadkill. I just came across this deficit concept about a week ago so it's not exactly clear in my mind yet.

Sorry, I guess "value" was not what I meant, I did mean measurement on the hygrometer. I can see that "value" would be the absolute humidity, which is not equal between the two temperature examples.

And this is due to the deficit, or the actual amount of vapor that is missing? So for 90F there would be a 0.008 kg/m^3 deficit and at 60F there would be a 0.003 kg/m^3 deficit. I guess that vapor amount (kg/m^3) would be another way of expressing the deficit, instead of vapor pressure.

No doubt. There must be some humidity level that they do their absolute best at and now I think that would be a measurement of moisture deficit like VPD, not RH.

I think that when we give out recommendations of humidity levels, it should have a temperature attached to it. Just saying that the enclosure should be, say, 80% RH, without a corresponding temperature could lead a keeper to make errors. Like 1) placing a hygrometer in a basking area and trying to keep high humidity in an area that is really hot - endless misting and ventilation-cutting that is probably unnecessary; or 2) placing a hygrometer in the cool zone, where 80% can be easily maintained but the rest of the enclosure is too dry. I usually try to measure humidity in a area of mid-range temperature. Maybe a better recommendation would to maintain 80% RH at 90F, for example.

<blockquote data-quote="dpjm" data-source="post: 160171" data-attributes="member: 549">Thanks for contributing, Roadkill.&nbsp; I just came across this deficit concept about a week ago so it's not exactly clear in my mind yet.Sorry, I guess &quot;value&quot; was not what I meant, I did mean measurement on the hygrometer.&nbsp; I can see that &quot;value&quot; would be the absolute humidity, which is not equal between the two temperature examples.And this is due to the deficit, or the actual amount of vapor that is missing?&nbsp; So for 90F there would be a 0.008 kg/m^3 deficit and at 60F there would be a 0.003 kg/m^3 deficit.&nbsp; I guess that vapor amount (kg/m^3) would be another way of expressing the deficit, instead of vapor pressure.No doubt.&nbsp; There must be some humidity level that they do their absolute best at and now I think that would be a measurement of moisture deficit like VPD, not RH.I think that when we give out recommendations of humidity levels, it should have a temperature attached to it.&nbsp; Just saying that the enclosure should be, say, 80% RH, without a corresponding temperature could lead a keeper to make errors.&nbsp; Like 1) placing a hygrometer in a basking area and trying to keep high humidity in an area that is really hot - endless misting and ventilation-cutting that is probably unnecessary; or 2) placing a hygrometer in the cool zone, where 80% can be easily maintained but the rest of the enclosure is too dry.&nbsp; I usually try to measure humidity in a area of mid-range temperature.&nbsp; Maybe a better recommendation would to maintain 80% RH at 90F, for example.</blockquote>

[QUOTE="dpjm, post: 160171, member: 549"] Thanks for contributing, Roadkill. I just came across this deficit concept about a week ago so it's not exactly clear in my mind yet. Sorry, I guess "value" was not what I meant, I did mean measurement on the hygrometer. I can see that "value" would be the absolute humidity, which is not equal between the two temperature examples. And this is due to the deficit, or the actual amount of vapor that is missing? So for 90F there would be a 0.008 kg/m^3 deficit and at 60F there would be a 0.003 kg/m^3 deficit. I guess that vapor amount (kg/m^3) would be another way of expressing the deficit, instead of vapor pressure. No doubt. There must be some humidity level that they do their absolute best at and now I think that would be a measurement of moisture deficit like VPD, not RH. I think that when we give out recommendations of humidity levels, it should have a temperature attached to it. Just saying that the enclosure should be, say, 80% RH, without a corresponding temperature could lead a keeper to make errors. Like 1) placing a hygrometer in a basking area and trying to keep high humidity in an area that is really hot - endless misting and ventilation-cutting that is probably unnecessary; or 2) placing a hygrometer in the cool zone, where 80% can be easily maintained but the rest of the enclosure is too dry. I usually try to measure humidity in a area of mid-range temperature. Maybe a better recommendation would to maintain 80% RH at 90F, for example. [/QUOTE]

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