Physics Key


First let's talk about the cookies. Cookies are simply a way for a website to store information about you in your browser. But don't worry the cookies can only store the information you give to the website. Cookies are stored in your browser and the browser is stored in your computer which means the cookeis are not stored in server, they are in your computer in your browser. Only that website which sent the cookie can read it.

Cookies are vital for web services. Without a cookie you can not log in to any websites at all! Most websites use cookies to help users easily navigate such as if you are logged in, a cookie can be used to redirect to a page you want to visit and this way you don't need to find the page again.

Physics Key Cookies

Physics Key now uses a cooke named "_ap_id" which is unique for each visitor which is used in Physics Key's own analytics such as to count the number of page views. This cookie is also used with the Push Notifications Analytics and Adblock Analytics along with the IP address and the browser's user agent. This cookie does not store any personal information at all.

Third Party Cookies

Third party means they are not sent by Physics Key but sent by other services Physics Key uses. Physics Key uses different third party services and they send their own cookeis for their service. If you use Physics Key, you must agree to the cookie policies of the services Physics Key uses.


Physics Key uses cloudflare's service which uses a cookie named '__cfduid'. If you want to learn more about this cookie, click here. Cloudflare's service may use other cookies regarding its analytics purposes.


We use Google Analytics and Google Adsense services by Google. The services of Google uses cookies. To learn about the types of cookies used by Google visit this link. We use Google Analytics service of Google to get the information such as the number of page views which uses cookies for its service. To learn about the cookie usage by Google Analytics click here. You can opt out of tracking by Google Analytics by using an add-on by Google.

Physics Key depends on advertising revenue, so you'll be able to get the contents or services for free. And this is possible by serving some ads that may be useful to you. Physics Key uses Google Adsense service for serving ads which uses cookies, to learn more read the article "How Google uses data when you use our partners' sites or apps".


We use MathJax for displaying beautiful math and MathJax library uses a cookie named "mjx.latest" to show equations in Physics Key.

If you do not want cookies, you can disable cookies in your browser but you may not be able to get all features.

Push Notifications

Physics Key asks your permission to send appropriate push notifications to you. The service allows us to send you appropriate notifications such as notifying you about updates. That way you'll be notified if any new changes occur in Physics Key and you can get the optimum benifit from it.

Physics Key has built in push notifications analytics which tracks whether you accepted the notification request or blocked it. After accepting the notification, Physics Key also stores information such as whether a notification sent to you is clicked or closed to determine how much engagement the notification is bringing and whether the notification sent is helpful or not. In doing all of this the information Physics Key stores is your IP address and the device information provided by your favourite browser (user agent). You can always disable or enable push notifications for a website in your browser or device.

Adblock Analytics

Physics Key has built in adblock analytics which allows to understand traffic with adblock enabled or disabled or without any adblockers. Physics Key is alive and the content is provided for free because of the ads. In the time being you can still use Physics Key with adblockers enabled but if the users using adblockers are too high, Physics Key won't allow you to use adblockers. In that case you'll still be able to surf Physics Key with adblockers disabled or removed or adding Physics Key in the safe list of an adblocker. To distinquish the traffic, Physics Key stores the IP address and the device information (user agent provided by browser) of users using adblockers.

Personal Information

Physics Key stores your name, email address, location(provided by you) as your personally identifiable information (PII), as well as stores anynomous information such as your IP address and device information provided by your browser. We don't store user's password, the login is integrated with Google account only for now. You must have a Google account if you want to create an account in Physics Key.

Anonymous information is used for providing services like how many times a particular article is viewed. Physics Key also gets your helpful feedbacks about a particular article is helpful or not. And that information is stored along with your IP address and the device information provided by your browser also called user agent.

Your email address is never shown to anyone and that is only used for your own login, while other information such as name and location are publicly visible information required for the community to see and interact with you.

We collect anonymous data such as IP address, geolocation based on that IP address, and website activity logs. The website activity logs include your feedback information along with your IP address and your browser's user agent.

Physics Key uses third party services such as Google Analytics, Google Adsense, Cloudflare, Facebook and MathJax. They provide their own cookies for their services. Physics Key has no control over these cookies sent by the third parties, and if you want to learn more about what cookies these services send and for what purpose, you can visit their website for more information. Physics Key is in complient with the privacy laws such as GDPR, CCPA and CalOPPA. We take the privacy of users very seriously and respect any privacy related laws. And the third party services we use also agree to be in complient with these laws (read their privacy policies).

Ads are served via Google Adsense, and Google uses your past activity on Google (not on Physics Key) on your permission (see their privacy policy for more details) to serve those ads to you. You can always opt out of saving your past activity or delete that information in your Google's account if you want. Or you can simply allow Google to use your past activity for more appropriate recommendations for you, and it all depends on your choice.

Tuesday, November 21, 2023 Coordinated Universal Time