isotherm


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isotherm,

line drawn on a map of a particular region of the earth's surface connecting points of equal temperature; each point reflects one temperature reading or an average of several readings over a period of time. The relative spacing of the isothermal lines indicates a temperature gradient, i.e., the amount of temperature change over a given distance.

Isotherm

 

an isogram of the temperature of air, water, or soil. Most commonly drawn are isothermal maps showing mean monthly air temperature over a number of years, mean temperature for any period of time, or the temperature at a definite moment of time. To eliminate the influence of elevation when drawing isotherms, temperature values are sometimes reduced to sea level, assuming that air temperature drops an average of 0.6 °C for each 100 m of increase in elevation.


Isotherm

 

a line on a phase diagram depicting a process occurring at constant temperature (an isothermic process). The equation of the isotherm of an ideal gas is pV = const, where p is the pressure and V is the volume of the gas. For a real gas the equation of an isotherm has a more complex character and becomes the equation for the isotherm of an ideal gas only at low pressures or high temperatures. On a pV diagram, at the point of intersection of the isotherm and the adiabatic curve the latter is steeper than the isotherm. The isotherms of ferromagnets in J, H, coordinates, where J is the magnetization and H is the magnetic field intensity, have a similar character.

isotherm

[′ī·sə‚thərm]
(geophysics)
A line on a chart connecting all points of equal or constant temperature.
(thermodynamics)
A curve or formula showing the relationship between two variables, such as pressure and volume, when the temperature is held constant. Also known as isothermal.

isotherm

isothermclick for a larger image
The line on the weather chart joining places of equal temperature. These are normally drawn for even 5°C intervals. These lines are customarily indicated in red.

isotherm

1. a line on a map linking places of equal temperature
2. Physics a curve on a graph that connects points of equal temperature
References in periodicals archive ?
The magnitude of E by Dubinin Radushkevich isotherm reveals the nature of the adsorption process.
The relationship between the moisture content of a certain product and the relative humidity at equilibrium at a given temperature can be expressed by mathematical equations, so-called sorption isotherms or hygroscopic equilibrium curves (Goneli et al.
The Freundlich isotherm empirical model in its linear form can be expressed as (Freundlich, 1906)
This variable can be calculated according to Equation 10 by plotting the sorption isotherms as ln ([a.
Figure 5(c) depicts the Temkin isotherm plots for the PNP uptake onto the active carbons from which the relevant Temkin adsorption isotherm values are obtained and are shown with values of correlation coefficients in Table 2.
Freundlich isotherm exhibits an empirical relationship of adsorption of adsorbate to the adsorbent.
Conclusion: From the present study, it may be inferred that partition of dye between the bulk solution and bio-sorption was indicated from Langmuir isotherms.
The Temkin isotherm model is represented by the following equation:
Adsorption isotherms provide this relationship for two equilibrium phases.
2) The Langmuir isotherm model is applicable to homogeneous adsorption where the adsorption of each adsorbate molecule on to the surface has equal sorption activation energy.
In case of isotherm study sample solutions (50-200 mg/L) with rice husk concentration (2g/150ml) were shaken in the orbital shaker at 120 revolutions per minute and at a temperature and timing of 30C and two hours respectively.