A. b. what difference between is and phase of iron?
Answers
Answer:
At atmospheric pressure, three allotropic forms of iron exist: alpha iron (α), gamma iron (γ) (also known as austenite), and delta iron (δ). At very high pressure, a fourth form exists, called epsilon iron (ε) hexaferrum. Some controversial experimental evidence exists for another high-pressure form that is stable at very high pressures and temperatures.[1]
The phases of iron at atmospheric pressure are important because of the differences in solubility of carbon, forming different types of steel. The high-pressure phases of iron are important as models for the solid parts of planetary cores. The inner core of the Earth is generally assumed to consist essentially of a crystalline iron-nickel alloy with ε structure.[2][3][4] The outer core surrounding the solid inner core is believed to be composed of liquid iron mixed with nickel and trace amounts of lighter elements
Answer:
While an excitation spectrum shows the wavelengths of light that a sample will absorb to be able to emit at a specified wavelength, an absorption spectrum shows all of the wavelengths at which light is absorbed by the sample.