Home » Thermodynamics

Thermodynamics

entropy in thermodynamics with examples and properties

What is Entropy in thermodynamics? The concept of entropy was introduced into the study of thermodynamics by Rudolph Clausius in 1856 to give a quantitative basis for the second law. It provides another variable to describe the state of a system to go along with pressure, volume, temperature and internal energy. If a system undergoes a reversible process during which ...

Read More »

Thermal conductivity:Definition,formula,examples and applications

“The rate of flow of heat across the opposite faces of a meter cube of a substance maintained at a temperature difference of one kelvin is called thermal conductivity of that substance.” Thermal conductivity equation Conduction of heat occurs at different rates in different materials.In metals, heat flows rapidly as compared to insulators such as wood or rubber.Consider a solid ...

Read More »

Difference between reversible and irreversible process in thermodynamics

Reversible process in thermodynamics “A process which can be retracted in exactly reverse order without producing any change in the surroundings is called reversible process”. In the reverse process, the system passes through the same stages as in the direct process but thermal and mechanical effects at each stage are exactly reverse. If heat is absorbed in the direct process, ...

Read More »

kelvin temperature scale with formula and examples

How to convert kelvin to degrees Celsius? Temperature on Celsius scale can be converted into kelvin by subtracting 273 from temperature in kelvin scale. Kelvin to celsius formula  C = T (k) – 273 Kelvin to ºC example problems Convert 300 kelvin to ºC Solution: T = 300 k Formula:       C = T (k) – 273 C = (300 ...

Read More »

Celsius to kelvin conversion formula with examples

How to convert degrees  celsius to kelvin The temperature on kelvin scale can be converted by adding 273 in the temperature Which is in degree centigrade C on Celsius scale.Its formula is given as:          T (k) = 273 + C 0 ºC to kelvin C = 0 ºC As   T = 273 + C T = ...

Read More »

Difference between latent heat of fusion and latent heat of vaporization

Latent Heat of Fusion Definition Heat energy required to change unit mass of a substance from solid to liquid state  at its melting point without change in its temperature is called its latent heat of fusion. When a substance is changed from solid to liquid state by adding heat, the process is called melting or fusion. The temperature at which ...

Read More »

What is convection current?|Definition,examples and applications

  The upward and downward movement of molecules of water or air is called a convection current. What is Atmospheric Convection? Atmospheric convection plays a fundamental role in determining the global climate patterns and in our daily weather variations.Gliders pilots and condors alike seek the convection thermals that ,rising from the warmer Earth beneath,keep them aloft.Huge energy transfers take place ...

Read More »

Difference between gas turbine and steam turbine

Idea of gas turbine is very old one,its working principle is an advanced version of wind mill.To achieve efficient working of turbine,the movement of  gas is controlled and directed to blades.The air which is under pressure supplied to turbine by air compressor. In gas turbine initially the air is obtained from atmosphere and compressed in air compressor.The air which is ...

Read More »

Difference between impulse turbine and reaction turbine

Comparison between Impulse turbine and a reaction turbine Following are the some points of comparison between an impulse and reaction turbine. Impulse Turbines In impulse turbine steam flows through nozzle and impinges in moving blades. The steam hits on the buckets with Kinetic energy. The steam pressure remains constant. Their relative velocity remains constant. Blades are symmetrical. Number of stages ...

Read More »

Difference between diesel and petrol engine

Diesel Engine properties Diesel engine only draws air during suction stroke. The fuel is injected in the form of fine spray. Combustion of fuel takes place at constant pressure. The diesel engine are heavier and costlier. Starting of diesel engine is difficult due to high compression ratio. The maintenance cost of it is large. They are low speed engines. They ...

Read More »