The reason it is hard to observe a liquid transforming to a perfectly solid âideal glassâ is that to do so we would have to wait an extraordinarily long time (much longer than centuries) because the process is very slow. But the behaviour of viscous liquids is more surprising than simply having to wait a long time.
Definition. Standard Temperature and Pressure (STP) is defined as 0 degrees Celsius and 1 atmosphere of pressure. Do not confuse STP with the STP Products Company, a maker of oil and fuel additives...unless you are reading one of their MSDS's! Additional Info. STP is used in many thermodynamic calculations and tabulations. Certain properties of matter such as density, viscosity, boiling point etc. will vary with changes in temperature or pressure. Having one common set of conditions (state) for tabulating these values makes comparisons possible and eases calculations.
In the last five to six decades, professionals and scientists using the metric system of units defined the standard reference conditions of temperature and pressure for expressing gas volumes as being 15 Â°C (288.15 K; 59.00 Â°F) and 101.325 kPa (1.00 atm; 760 Torr).owever, many technical publications (books, journals, advertisements for equipment and machinery) simply state standard conditions without specifying them, often leading to confusion and errors. Good practice is to always incorporate the reference conditions of temperature and pressure.