Shopping on line can be easy, simple and save you lots of money. It can also take a lot of your time, frustrate you, and result in unwanted purchases. Now the same can be said for regular high street shopping, but with the vast opportunity presented by the Internet it will pay you to spend a few minutes reading this and understanding how to better optimize your Triple Point shopping experience:
1. Compare - without doubt the biggest advantage that the Triple Point offers shoppers today is the ability to compare thousands of Triple Point at a time. This is a great thing, but not necessarily all the time! Too much can be daunting at times so take advantage of the great comparison sites and where possible let them do the hard work for you.
2. Research - if it has been said it will be on the internet. Ignorance is no longer a justifiable reason for buying the wrong thing. Take the time to research in detail everything that you could possible want to know about
3. Testimonials - don't know anybody that has bought a Triple Point? Wrong! If the Triple Point is good the internet will let you know. Use the Internet as a friend and get testimonials before you buy.
4. Questions - Got a question about Triple Point then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....
5. Reputation - Never heard of the company selling Triple Point? Don't worry, no reason why you should know every company in the world, but you know someone that does! Use the internet to find out what people are saying about Triple Point and build up a picture of their reputation for sales, returns, customer service, delivery etc.
6. Returns - still worried that even after all of the above your Triple Point wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.
7. Feedback - happy with your Triple Point then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.
8. Security - check for the yellow padlock on the Triple Point site before you buy, and the s after http:/ /i.e. https:// = a secure site
9. Contact - got a question about Triple Point, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.
10. Payment - ready to pay for your Triple Point, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.
In physics and chemistry, the
triple point of a substance is the temperature and
pressure at which three
Phase (matter) (gas,
liquid, and solid) of that substance may coexist in
thermodynamic equilibrium.
For example, the triple point temperature of
Mercury (element) is at −38.8344 °C, at a pressure of 0.2 mPa.
The triple point of water is used to define the
kelvin, the SI SI base unit of thermodynamic temperature. The number given for the temperature of the triple point of water is an exact definition rather than a measured quantity.
Triple point of water
The single combination of pressure and temperature at which pure
water, pure ice, and pure water vapour can coexist in a stable equilibrium occurs at exactly 273.16
kelvins (0.01 °C) and a pressure of 611.73
pascal (unit)s (ca. 6.1173
bar (unit), 0.0060373057 atmosphere (unit)). At that point, it is possible to change all of the substance to ice, water, or vapor by making infinitely small changes in pressure and temperature. Strictly speaking, the surfaces separating the different phases should also be perfectly flat, to avoid the effects of surface tensions.
Water has an unusual and complex phase diagram, although this does not affect general comments about the triple point. At high temperatures, increasing pressure results first in liquid and then solid water. (Above around 10^9 Pa a crystalline form of ice forms that is denser than water.) At lower temperatures under compression, the liquid state ceases to appear, and water passes directly from gas to solid.
At constant pressures above the triple point, heating ice causes it to pass from solid to liquid to gas, or
steam, also known as water vapor. At pressures below the triple point, such as those that occur in
outer space, where the pressure is near zero, liquid water cannot exist. In a process known as
Sublimation (chemistry), ice skips the liquid stage and becomes steam when heated.
Triple Point Cells
Triple point cells are useful in the
calibration of thermometers. For exacting work, triple point cells are typically filled with a highly pure chemical substance such as hydrogen, argon, mercury, or water (depending on the desired temperature). The purity of these substances can be such that only one part in a million is a contaminant; what is called “six-nines" because it is 99.9999 % pure. When it is a water-based cell, a special
isotope composition called
Vienna Standard Mean Ocean Water water is used because it is very pure and produces temperatures that are more comparable from lab to lab. Triple point cells are so effective at achieving highly precise, reproducible temperatures, an international calibration standard for thermometers called International Temperature Scale of 1990 relies upon triple point cells of hydrogen, neon, oxygen,
argon,
mercury (element), and
water (molecule) for delineating six of its defined temperature points.
Establishing "sea level" on Mars
The zero-elevation or "sea level" of Mars is defined as the height at which the atmospheric pressure corresponds to the triple point of water.
See also
External links
- Definition of the kelvin at BIPM
- Water at Triple Point Video
- Phase diagram of water
In physics and chemistry, the
triple point of a substance is the
temperature and
pressure at which three Phase (matter) (gas, liquid, and
solid) of that substance may coexist in thermodynamic equilibrium.
For example, the triple point temperature of
Mercury (element) is at −38.8344 °C, at a pressure of 0.2 mPa.
The triple point of water is used to define the kelvin, the SI SI base unit of thermodynamic temperature. The number given for the temperature of the triple point of water is an exact definition rather than a measured quantity.
Triple point of water
The single combination of pressure and temperature at which pure water, pure ice, and pure
water vapour can coexist in a stable equilibrium occurs at exactly 273.16 kelvins (0.01 °C) and a pressure of 611.73
pascal (unit)s (ca. 6.1173 bar (unit), 0.0060373057 atmosphere (unit)). At that point, it is possible to change all of the substance to ice, water, or vapor by making infinitely small changes in pressure and temperature. Strictly speaking, the surfaces separating the different phases should also be perfectly flat, to avoid the effects of surface tensions.
Water has an unusual and complex
phase diagram, although this does not affect general comments about the triple point. At high temperatures, increasing pressure results first in liquid and then solid water. (Above around 10^9 Pa a crystalline form of ice forms that is denser than water.) At lower temperatures under compression, the liquid state ceases to appear, and water passes directly from gas to solid.
At constant pressures above the triple point, heating ice causes it to pass from solid to liquid to gas, or steam, also known as water vapor. At pressures below the triple point, such as those that occur in outer space, where the pressure is near zero, liquid water cannot exist. In a process known as
Sublimation (chemistry), ice skips the liquid stage and becomes steam when heated.
Triple Point Cells
Triple point cells are useful in the
calibration of
thermometers. For exacting work, triple point cells are typically filled with a highly pure chemical substance such as hydrogen, argon, mercury, or water (depending on the desired temperature). The purity of these substances can be such that only one part in a million is a contaminant; what is called “six-nines" because it is 99.9999 % pure. When it is a water-based cell, a special isotope composition called Vienna Standard Mean Ocean Water water is used because it is very pure and produces temperatures that are more comparable from lab to lab. Triple point cells are so effective at achieving highly precise, reproducible temperatures, an international calibration standard for thermometers called International Temperature Scale of 1990 relies upon triple point cells of hydrogen, neon, oxygen,
argon,
mercury (element), and water (molecule) for delineating six of its defined temperature points.
Establishing "sea level" on Mars
The zero-elevation or "sea level" of
Mars is defined as the height at which the atmospheric pressure corresponds to the triple point of water.
See also
External links
- Definition of the kelvin at BIPM
- Water at Triple Point Video
- Phase diagram of water
Triple point - Wikipedia, the free encyclopedia
In physics and chemistry, the triple point of a substance is the temperature and pressure at which three phases (for example, gas, liquid, and solid) of that substance coexist in ...
Triple Point Calibrations
Triple Point Calibrations is the Representative of Fluke Precision Measurements equipment throughout South Australia, Victoria, Tasmania, Western
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Triple Point - News
August 08. TP70 2008 (I) VCT plc interim results to 30 June 2008. The quarterly interim results for TP70 2008 (I) VCT plc have been published.The
Triple Point Profile
Acting much like an in-house art department, we cater to all of Triple Point’s creative needs. We create and produce financial documents (but don’t worry, the numbers are ...
Definition: triple point from Online Medical Dictionary
The Online Medical Dictionary is a searchable dictionary of definitions from medicine, science and technology.
Commodity Trading & Risk Management Solutions - Triple Point ...
Provides energy trading and risk management software to the global marketplace.
Westport, Connecticut, USA www.tpt.com
Directory 2008 reprinted from Energy Risk's Technology special report energyrisk.com Triple Point Technology H Westport, Connecticut, USA www.tpt.com Triple Point Technology ® is ...
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Contact Us You can contact triple point calib r ations from the details below: 190 Wright Street Adeliade, SA 5000 . Phone: +61 8 8231 3455
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