iPhone Screenshots

Description

The COVID-19 is more susceptible to infection when the humidity ratio is less than 6g/kg(42gr/lb), according to UMD.
Check the humidity with this app & prevent infection!

If you use this app, you can easily obtain "Temperature-humidity index(Discomfort Index)", "WBGT(Heat stroke index)", "Dew point temperature", etc., from weather information.
Furthermore, the app calculates the air condition from dry-bulb temperature(Td) and wet-bulb temperature(Tw) obtained by Assmann-Psychrometer, etc., and the app can also input atmospheric pressure.
The app can calculate 11 items and 13 indicators, and conversion to the Celsius temperature and SI units (or in the Fahrenheit temperature and Imperial and US customary measurement systems) also you can simply by switching of "Temperature Unit".
The items and indicators that this app can calculate are as follows.

- Dew Point Temperature
- Relative Humidity
- Humidity Ratio(Absolute Humidity)
Weight absolute humidity
Weight absolute humidity in the more smaller unit.
Volume absolute humidity
- Humidity Deficit
- Enthalpy
- Specific Volume
- Equilibrium Vapor Pressure
- Partial Pressure
- Boiling Point of Water
- WBGT(Estimated value)
- Discomfort Index[Temperature-humidity index]

(( Supplementary explanation about the WBGT(Estimated value) and the Discomfort index.

The calculation formula of the outdoor WBGT is "WBGT = 0.7 Tnw + 0.1 Td + 0.2 Tg", but since there is no entry a item Globe thermometer temperature(Tg) in the app, so estimation the Globe thermometer temperature(Tg) by Dry-bulb temperature(Td).
- Calculation formula : "Tg = 1.45 Td - 27.162 [Temperature unit: ℉]”
There is a very strong correlation between Globe thermometer temperature(Tg) and Dry-bulb temperature(Td).
[Statistical information on this correlation : The number of samples is 17376 and the coefficient of determination(R^2) when statistics are taken is 0.919]

For natural wet-bulb temperature(Tnw), convert the Wet-bulb temperature(Tw) obtained by measurement by the Assmann Psychrometer to the Wet-bulb temperature(Tw) measured in natural state, a use it as Natural wet-bulb temperature(Tnw).
The natural state here means that the wind speed at the time of measurement is 5 meters per second(16.4 feet per second) or less.
The algorithm of this conversion is very special, so we omit the explanation.

"Discomfort Index" is "Temperature-humidity index".
The calculation formula is "Discomfort Index[DI] = 0.4 × (Td + Tw) +15 [Temperature unit: ℉]". ))

If you want to get the current atmospheric pressure, the current dry-bulb temperature(Td) and the current wet-bulb temperature(Tw), tap the "Weather" information button. By the way, In iPhone6, etc., you can get the atmospheric pressure by pressing "MEAS" button.
You can choose conditions of the wet bulb is you can choose any one of the “Normal" or “Froze” (※ If you choose the “Froze”, setting is enabled in when if sub-zero in wet-bulb temperature(Tw) ).
Even if you enter the measurement value such as a non-draft type psychrometer(for example, "Augusto Psychrometer", etc.), just tap the button and the corresponding value can be displayed (※ the app is subject to use of a ventilation type psychrometer in terms of measurement accuracy).
The app can receive the calculated value of dry bulb temperature (Td) and wet bulb temperature (Tw) from the sister app “Calculator of Air”.
If you use this function, you can input "dew point temperature", "relative humidity", etc. (※ there is a need to start up the "Calculator of Air" first).
Input range is the temperature is -30 ℃ to 50 ℃ (-22 ° F to 122 ° F), the atmospheric pressure is 600 hPa to 2475 hPa(17.72 inHg to 73.09 inHg).

This app is using the OpenWeatherMap(CC BY-SA4.0).


- Disclaimer 1.
Please input and use the temperature range(0 ℃ to 40 ℃ / 32°F to 104°F ) according to common sense as much as possible. If you enter an extreme value correct calculation result may not appear.

- Disclaimer 2.
We are not liable for any damage caused by the use of this application does not bear all of the responsibility.

What’s New

Version 1.1.7

- Partially corrected the description text in Japanese environment App Store.
- Changed partially text in first 5.5 inch screenshot.

Ratings and Reviews

5.0 out of 5
1 Rating

1 Rating

Tx9753 ,

Good features, needs more info

First I wish there was a paid option to not have ads. More importantly, I like the specific features but need more background on how some things are calculated. WBGT is 'estimated' but how? That is far from easy to do right. And what is the discomfort index reported? And there is no way to ask . Developer, please consider an update with info, And perhaps an ad free upgrade, and a way to ask such questions.
Update (4/5/17): developer responded via App Store, thanks! But still have questions: how is WBGT estimated, and what discomfort index is used? Thank you.
Update: 4/15/17. Thank you to the developer for the details on the wbgt estimation. The globe temperature is the hardest to accurately estimate, but thank you for listing your equation. Also thanks for listing the discomfort index equation in your app. I appreciate your support and use your app. Excellent post script- I give 5 stars now.

Developer Response ,

(4/11/17)
Dear Tx9753.

Thank you for your new question.
I am sorry for the copy and paste from Description of the AppStore, this is the answer to your question.
That’s because of my Japanese people,my not good at English. There may have been a strange part in sentence expression, apologize about this matter. At the risk of repetition, thank you for your comment.
From the developers of this app.

★★ Supplementary explanation about the WBGT(Estimated value) and the Discomfort index. ★★

The calculation formula of the outdoor WBGT is "WBGT = 0.7 Tnw + 0.1 Td + 0.2 Tg", but since there is no entry item Globe thermometer temperature (Tg) in this application, estimation the Globe thermometer temperature(Tg) by Dry-bulb temperature (Td).
- Calculation formula: "Tg = 1.45 Td - 27.162 [Temperature unit: ℉]”
There is a very strong correlation between Globe thermometer temperature (Tg) and Dry-bulb temperature (Td).
[Statistical information on this correlation : The number of samples is 17376 and the coefficient of determination(R^2) when statistics are taken is 0.919]
For Natural wet-bulb temperature (Tnw), Convert the Wet-bulb temperature(Tw) obtained by measurement by Assmann psychrometer to the Wet-bulb temperature(Tw) measured in natural state, a use it as Natural wet-bulb temperature (Tnw).
The natural state here means that the wind speed at the time of measurement is 5 meters per second(16.4 feet per second) or less.
The algorithm of this conversion is very special, so we omit the explanation.

"Discomfort Index" is "Temperature-humidity index".
The calculation formula is "Discomfort Index[DI] = 0.4 × (Td + Tw) +15 [Temperature unit: ℉]".



(4/5/17)
Dear Tx9753.

Thank you for your comment.
You about the matter pointed out is wrote the answer on the Description section in the AppStore.Could you please view it if you don’t mind?
I am sorry to you, but there is no plan for will change to paid application.
Because of my Japanese people,my not good at English. There may have been a strange part in sentence expression, apologize about this matter.
At the risk of repetition, thank you for your comment.

From the developers of this app.

App Privacy

The developer, yoshihito sakagami, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.

Supports

  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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