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Generally enthalpy is analgous to the energy of a material at a particular temperature and pressure. It is calculated to determine the energy a material holds, or more often, enthalpy differences are calculated to determine how much energy is required to bring a material from one temperature and pressure to another temperature and pressure.
Enthalpy is the amount of energy in a system and when this changes (when a reaction happens), the energy is either released (exothermic) or absorbed (endothermic) and this energy is usually released or absorbed as heat. Therefore when the enthalpy decreases, heat is released from the system making it exothermic. In contrast, when the enthalpy increases, heat is absorbed making it endothermic.
it is the total energy required to create any system by displacing its volume and pressure.
Yes it is possible, for example when water freezes there is a point when the temperature remains constant however energy is released as the water condenses.
See links below. See also Perry And Green's Chemical Engineering Handbook Page Chapter 2, page 2-273.
you read it.
can some one help me read a chart in my A&P lab manual
Pressure is not affected by enthalpy and entropy.pressure
Constant pressure enthalpy is a measure of the energy content of a system at a constant pressure. During a process, changes in the system's energy content are reflected in the enthalpy changes. The relationship between constant pressure enthalpy and changes in energy content is that they are directly related - as the enthalpy changes, so does the energy content of the system.
The enthalpy of air can be calculated using the equation: enthalpy internal energy pressure volume. This equation takes into account the internal energy of the air and the pressure and volume of the system.
the Mollier chart gives the values of a property say enthalpy by defining any other two properties i.e. dryness fraction,pressure like this any two fixed values can provide the other values.
Enthalpy is a particular amount of heat that is produced or released at a given pressure. There are specific equations that must be used to calculate enthalpy.
Please see the related link below, for an easy to read chart.
A psychometric chart is a graph of the thermodynamic parameters of moist air at a constant pressure, often equated to an elevation relative to sea level. The chart is normally set at dry bulb temperature, wet bulb, dew point, relative humidity, humidity ratio, specific enthalpy. Read on a horizontal vs diagonal intersection.
The name for the internal heat of a system at constant pressure is enthalpy, symbolized as "H."
Heat equals enthalpy in a chemical reaction when the reaction is carried out at constant pressure.
The enthalpy of condensation for a substance is the amount of heat released when a gas transforms into a liquid at constant pressure.