Essential Oils and Dermatology Formulations Guide
The Therapeutic Power of Aromatic Plant Essences
Aromatherapy is used to treat ailments with highly concentrated oils extracted from plants. These extracts, called essential oils, contain the essences or perfume substances that give plants their characteristic odor.
Essential oils are produced from tiny glands present in the petals, stem, bark, and wood of many plants and trees. In nature, these glands release aromas progressively from the plants. When crushed or heated, they explode and release the
Read MoreAtomic Structure: From Dalton to the Quantum Model
Dalton’s Atomic Theory
In the nineteenth century, English chemist John Dalton, drawing on the ideas of Leucippus and Democritus, set out the atomic theory which states that:
- Chemical elements are composed of tiny indivisible particles called atoms.
- Atoms of the same element are equal in mass and other properties.
- Atoms of different elements differ in mass and other properties.
- Atoms of different elements combine to form compounds.
Discovery of the Electron
Michael Faraday applied electric shocks to containers
Read MoreGas Properties: Specific Volume, Viscosity, and Compressibility
Specific Volume (v) is the volume occupied by a unit mass of material. It is the inverse of density and does not depend on the amount of matter. For example, two pieces of iron with different sizes have different weights and volumes, but their specific gravities are equal. This is independent of the material amount. Examples of intensive properties include boiling point, brightness, color, hardness, and melting point.
Where: V is volume, m is mass, and ρ is the density of the material.
It is expressed
Steel Production: An Overview of Furnace Processes and Alloying Elements
Steel Production Processes
Open Hearth Furnace
One of the most popular steel production methods, the open hearth furnace, can hold 10 to 540 tons of metal. Its shallow depth allows flames to directly heat the load. Fuel sources include gas, tar, or oil. These regenerative furnaces often have side fireplaces to expel heated gases used for air and fuel heating. Open hearth furnaces typically have basic linings, but acid linings (silica and clay brick walls) also exist. Basic linings offer better control
Read MoreNuclear Stability and Reactions: A Comprehensive Overview
Nuclear Stability and Reactions
From Two Viewpoints: Nuclear Power and Energy
A. Strong Nuclear Force
The strong nuclear force, theorized by Hideki Yukawa, is the strongest of the fundamental forces but has the shortest range. It is independent of charge and works only for particles within a distance of less than 10-16 meters. For distances between 10-16 and 10-14 meters, there is less repulsion. Nuclei with approximately equal numbers of protons (Z) and neutrons (N) are stable. As Z increases, the
Read MoreStoichiometry and Natural Gas: LNG, LPG, and NGV
Stoichiometry
In chemistry, stoichiometry is the calculation of the quantitative relationships between reactants and products during a chemical reaction. These relationships can be deduced from the atomic theory, although historically spelled out without reference to the composition of matter, according to different laws and principles.
The first to set out the principles of stoichiometry was Jeremias Benjamin Richter (1762-1807) in 1792. He wrote:
Stoichiometry is the science that measures the quantitative
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