Why Mercury is used in Thermometers?? Why not Water?

Ever ruminated why only mercury is used in thermometers or in blood pressure measuring devices?

Well, when one is asked for the reason, a lot of people simply don't know and don't care, but the others who answered their answers were surprising, these answers included, -

• " Mercury is used in thermometers since its the only metal at liquid state in room temp." Now so what? the answer followed "so something must be happening".

Well is it necessary to use a metal for this purpose?

          NO. Not at all. there is nothing like that. Metallic characteristics have nothing to do with measuring temperatures. This is something a lot of people don't know. Even water can be used in place of mercury but there is a major disadvantage because of which it is not used.

Why Mercury?

Its because of its density. Mercury has a density 13.6 gram/cm^3, Which enables us to measure wide and most favourable range of pressure in a small volume. It is the density of mercury that make it a perfect choice for thermometers and bp machines. 1 atm is equivalent to 760mm of Hg (Mercury). 

                                {Provided the cross sectional area is very small}

What If Water Is Used In Place Of Mercury?

Well, this is the question one must be thinking about now?

If water is used then the length of the device containing it will be too large.

So, to better understand this, let's see the answer to this question-

• If water is used in place of mercury, then what should be the minimum length of barometer tube to measure the normal atmospheric temperature? 

{Barometer - an instrument measuring atmospheric pressure, used especially in forecasting the weather and determining altitude.}

**-- Thermometer too uses the same concept based on temperature difference to show the variations. --**

BAROMETER

 

We know 1 atm = 76 cm of Hg.

let p1, p2 be density of water and mercury respectively and h1, h2 be their heights.

Now,

1 atm = p1 x g x h1 = p2 x g x h2

 {p1 = 1g/cm^3 and p2 = 13.6g/cm^3}

thus,

1 x h1 = 13.6 x 76

h = 1033 cm

h = 10.33 m

Clearly,

          what could be represented by 76 cm of Hg requires 10.33 m of water. 

Similarly in case of thermometer too, using water would be impractical because of its high length requirement. 

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Weirdest and effective way to FIX "Laptop's Keyboard Not Working/Responding" Problem!!

Laptop's keyboard Not Working

FIXED!!! 

You're working on your laptop, and all of a sudden, the "I" key stops working, or a whole section of your KEYBOARD stops responding to keystrokes. Worse yet, the keyboard cuts out entirely. While this can be a hassle, particularly when you have work due, there are a few things you can try yourself to get back to the job at hand.

Check for Crumbs

Hold your laptop upside down or at the very least at a 45- to 75-degree angle from horizontal and give the laptop a good shake. Sometimes, crumbs from working lunches or your last snack break can get stuck under the keys. This is more of a problem for older laptops, but it's worth a shot even on a new one.

If you have a keyboard vacuum or a can of compressed air, give the nooks and crannies of your keyboard a quick cleaning. If one or two keys are stuck because of soda spillage, you can try cleaning those individual key switches with a rag soaked in a couple of drops of cleaner like rubbing alcohol or even warm soapy water. Make sure you're applying the liquid to the cloth first and not directly to the keyboard. Pop the offending key cap off the keyboard and try to clean as much dried liquid from the key switch as possible. A cotton swab can come in handy here, just be careful and don't disassemble the key switch unless you know what you're doing.

If an extensive section of the keyboard is stuck because of liquid damage, like spilled cup of soda or coffee, your best recourse may be to have the keyboard assembly replaced.

NO CRUMBS???

   

 TRY THE WIERD 'CAUSE NORMAL ISN'T WORKING

Let's try The Ruminators way to tackle this problem!!

Have you been using a PC which is 3-4 years old in a rough manner. (not necessary)  If you are then, You might have faced this problem and there is a really really weird way of fixing this. Its had to believe but is really effective and can save your money and time. But, its effects are not permanent, i.e. you have to follow a certain algorithm every time you open your PC.  One might feel that the wire connecting the keyboard has been internally broken at some point and thus require some help from expert. And you might need such help indeed. But, before that you must try this. This algorithm is weird and you won't believe it works but just try and then see.

Before that just make sure that your PC satisfy these conditions,

• Not a single key of the keyboard is working.
• Power button and etc on the top are working well.
• OS has no problem loading itself.
• There is no external damage to the keyboard.
• USB ports are responding well, as You may need the help of an external mouse.

TRY THE ALGORITHM SHOWN ITS WORTH A SHOT. (90 sec Solution) (Time and money effective)

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