Karnataka Science and Technology Academy
Department of Science and Technology Government of Karnataka
Where does water boils faster?  The higher the altitude, the lower the boiling point of water. This is because the boiling point of water is linked to the air pressure. The higher the pressure,  the higher boiling point of water. As we go higher in altitude, the atmospheric pressure decreases. At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels. As water gets hotter, it changes to water vapor. When enough water vapor is produced, it exert pressure on water. The boiling point is the temperature at which the vapor pressure of the water is equal to the pressure exerted on the liquid by the surrounding atmosphere. The lower the air pressure, the less water vapor pressure that you need to boil so the boiling can start at a lower temperature.   As we go higher in altitude, the atmospheric pressure decreases. This results in decreasing the boiling point at higher altitude and increase in boiling of water. In fact, at the sea level, the the sea water boils at 100 degree C where  atmospheric pressure is normal. However, the boiling takes place at a lower temperature at the top of a mountain due to low pressure. In other words the boiling  is faster at the top of a mountain than that at its foot.
Did You Know ?
YOU BLINK 15,000 TIMES A DAY On average, you blink 15,000 times a day. That’s about 10 times per minute. The muscle that lets your eye blink is the fastest muscle in your body. It allows you to blink 5 times a second. There are multiple muscles that control reflexes of blinking. The main muscles, in the upper eyelid, that control the opening and closing are the orbicularis oculi and levator palpebrae superioris muscle. The orbicularis oculi closes the eye, while the contraction of the levator palpebrae muscle opens the eye. Frequent and gentle blinking is essential to maintaining healthy eyes and optimal vision because it allows your eyelids to keep your eyes coated with three beneficial layers of tears:  1.	The first layer of tears lies right up against the whites of your eyes, and provides an even coat of protein-rich moisture for the second layer to adhere to. 2.	The middle watery layer helps to wash away foreign debris. It also nourishes the cornea of your eyes with minerals, a variety of proteins, and moisture. 3.	The third outer layer of tears is somewhat oily. It serves to prevent the middle watery layer from evaporating quickly, and provides needed lubrication between your eyes and your eyelids. If your eyes are not regularly coated with the three layers of tears described above, they will be deprived of ongoing nourishment and cleansing, and they will be unnecessarily strained.  For further details visit http://drbenkim.com/blinking-healthy-eyes-vision.html
image source : https://www.studyblue.com/
image source : http://hendrix2.uoregon.edu/~imamura/102/images/Sea-Level-Barometric-Pressure.jpg
- Dr. Anand R, Scientific Officer II, KSTA
- Dr. Anand R, Scientific Officer II, KSTA
design, development and maintenance : KSTA