Mean kinetic temperature

Mean kinetic temperature

Mean kinetic temperature (MKT) is a simplified way of expressing the overall effect of temperature fluctuations during storage or transit of perishable goods. The MKT is widely used in the pharmaceutical industry.

The mean kinetic temperature can be expressed as:

T_K=\cfrac{\frac{\Delta H}{R}}{-\ln \left ( \frac{e^\frac{-\Delta H}{RT_1}+e^\frac{-\Delta H}{RT_2}+\cdots +e^\frac{-\Delta H}{RT_n}}{n} \right )}

Where:

T_K\,\! is the mean kinetic temperature in kelvins
\Delta H\,\! is the activation energy (typically within 60–100 kJ·mol-1 for solids or liquids)
R\,\! is the gas constant
T_1\,\! to T_n\,\! are the temperatures at each of the sample points in kelvins
n\,\! is the number of temperature sample points

The above equation is valid only when the temperature readings are taken at the same interval. A more general form for the above equation can be expressed as:

T_K=\cfrac{\frac{\Delta H}{R}}{-\ln \left ( \frac{{t_1}e^\frac{-\Delta H}{RT_1}+{t_2}e^\frac{-\Delta H}{RT_2}+\cdots +{t_n}e^\frac{-\Delta H}{RT_n}}{{t_1}+{t_2}+\cdots+{t_n}} \right )}

Where:

t_1\,\! to t_n\,\! are time intervals at each of the sample points

When t_1\,\!=t_2\,\!=\cdots=t_n\,\!, this equation will be reduced to the former equation.


Wikimedia Foundation. 2010.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • kinetic temperature — noun a measure of the energy of motion possessed by a substance; especially a function of the root mean square velocity of the molecules of a gas …   Wiktionary

  • Temperature — This article is about the thermodynamic property. For other uses, see Temperature (disambiguation). A map of global long term monthly average surface air temperatures i …   Wikipedia

  • Kinetic theory — [ temperature of an ideal monatomic gas is a measure related to the average kinetic energy of its atoms as they move. In this animation, the size of helium atoms relative to their spacing is shown to scale under 1950 atmospheres of pressure.… …   Wikipedia

  • Mean free path — In physics, the mean free path is the average distance covered by a moving particle (such as an atom, a molecule, a photon) between successive impacts (collisions) [1] which modify its direction or energy or other particle properties. Contents 1… …   Wikipedia

  • Temperature — The temperature is the specific degree of hotness or coldness of the body. It is usually measured with a thermometer. * * * The sensible intensity of heat of any substance; the manifestation of the average kinetic energy of the molecules making… …   Medical dictionary

  • Thermodynamic temperature — is the absolute measure of temperature and is one of the principal parameters of thermodynamics. Thermodynamic temperature is an “absolute” scale because it is the measure of the fundamental property underlying temperature: its null or zero point …   Wikipedia

  • Orders of magnitude (temperature) — Temperature in °C compared to the thermodynamic scale in electron volts, which are also used as a unit of temperature. List of orders of magnitude for temperature Factor Multiple Item 10−∞ 0 K …   Wikipedia

  • Glass transition temperature — The glass transition temperature, T g, is the temperature at which an amorphous solid, such as glass or a polymer, becomes brittle on cooling, or soft on heating. More specifically, it defines a pseudo second order phase transition in which a… …   Wikipedia

  • Dynamical mean field theory — (DMFT) is a method to determine the electronic structure of strongly correlated materials. In such materials, the approximation of independent electrons, which is used in Density Functional Theory and usual band structure calculations, breaks… …   Wikipedia

  • Root mean square speed — is the measure of the speed of particles in a gas that is most convenient for problem solving within the kinetic theory of gases. It is given by the formula:v {rms} = sqrt 3RT}over{M mwhere vrms is the root mean square speed, Mm is the molar mass …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”