Hello friends in the evening, the machine brother is a new meaning.
Recently, many friends came to me and asked me what the so-and-so parameter and so-and-so logo of the mobile phone tablet computer mean.
The machine brother pondered, to open a separate column, from time to time to give everyone a science popularization of these digital circles of cold knowledge.
Today is the first issue of the "Cold Knowledge" column, and I would like to start with a word that has been very common and unpopular recently:
5 ATM
Don't get me wrong, the "ATM" mentioned by the brother is not a bank ATM, nor is it an abbreviation for Ultraman.
If you have noticed, Huawei's recently released Watch GT 3 Pro watch will definitely see the waterproof rating column, in addition to the regular IP68, there is also a "5 ATM".
When Apple released the Apple Watch 7 last year, it also used this standard "5 ATM".
The reason we all understand, the manufacturer can mark the parameters, must be something. But what exactly does "5 ATM" mean?
According to Wikipedia:
Standard atmospheric pressure is a non-International Unit of Units of pressure, the unit symbol atm. There are different definitions of their specific values. The standard atmospheric pressure is generally defined as 101.325 kPa. Organizations such as ICAO and the International Organization for Standardization use this value.
Simply put, an ATM is a unit that indicates "pressure."
The machine brother first gives you a review, whether it is Huawei's watch or Apple's watch, their publicity points have diving.
When diving into the water, the deeper the dive, the greater the atmospheric pressure applied to the watch, so it is necessary to test their compressive ability.
Internationally, it is more common to see the standard of ATM's ability to withstand pressure.
And 5 ATM, is able to withstand the pressure of 5 units of this meaning:
Simulating a pressure at a 50-meter stationary water depth for 10 minutes at room temperature is not actually waterproof at 50 meters.
(Source: Huawei official website)
However, the machine brother has to say but.
Although the 5 ATM of these smart watches is a relatively high level, like smart phones, there is still no warranty after entering the water.
And they are on the official website, generally will list a very detailed non-applicable scenario, friends must be optimistic:
Well, the first issue of cold knowledge is here.
Friends still have what do not understand the standard, do not understand the icon, do not understand the logo, you can leave a message to tell the brother, the brother of the machine next time to continue to popularize science ~