J Per K
J Per K - Related Videos
07:30
Determining the Mass Percent Composition in an Aqueous Solution
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2023
Source: Laboratory of Dr. Neal Abrams — SUNY College of Environmental Science and Forestry Determining the composition of a solution is an important analytical and forensic technique. When solutions are made with water, they are referred to as being aqueous, or containing water. The primary component of a solution is referred to as the solvent, and the dissolved minor component is called the solute. The solute is dissolved in the solvent to make a solution. Water is the most common solvent in...
02:48
Bond Polarity, Dipole Moment, and Percent Ionic Character
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2020
Bond Polarity The absolute value of the difference in electronegativity (ΔEN) of two bonded atoms provides a rough measure of the polarity to be expected in the bond and, thus, the bond type. When the difference is very small or zero, the bond is covalent and nonpolar. When it is large, the bond is polar covalent or ionic. The absolute values of the electronegativity differences between the atoms in the bonds H–H, H–Cl, and Na–Cl are 0 (nonpolar), 0.9 (polar covalent), and 2.1 (ionic),...
01:21
100-Percent-Reserve Banking
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2025
Imagine an economy without any banks; the entire money supply is held by the public in the form of physical currency. This means that the amount of money in the economy is equal to the total value of currency held by households and firms.Now, a commercial bank is introduced, and the public is assumed to deposit all their currency into the bank. If the bank does not issue any loans and instead holds all the deposited money in reserve, it is known as a 100-percent-reserve banking system. In this...
08:09
Vasodilation of Isolated Vessels and the Isolation of the Extracellular Matrix of Tight-skin Mice
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Cited by 1 •
2017
We describe the isolation of cardiac extracellular matrix from C57Bl/6J control mice, tight-skin mice, and tight-skin mice treated with the IRF5 inhibitory peptide. We also describe the vasodilation studies on the isolated vessels from C57Bl/6J, tight-skin mice and tight-skin mice treated with the IRF5 inhibitory peptide.
08:31
Isolation and Genome Analysis of Single Virions using 'Single Virus Genomics'
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Cited by 2 •
2013
Single Virus Genomics (SVG) is a method to isolate and amplify the genomes of single virons. Viral suspensions of a mixed assemblage are sorted using flow cytometry onto a microscope slide with discrete wells containing agarose, thereby capturing the virion and reducing genome shearing during downstream processing. Whole genome amplification is achieved using multiple displacement amplification (MDA) resulting in genomic material that is suitable for sequencing.
FAQs
The relation dS = δQrev/T expresses how much entropy change accompanies a given amount of reversible heat transfer at temperature T. The same heat transfer therefore contributes differently depending on the temperature at which it occurs. Using J/K lets thermodynamic analyses quantify entropy changes and follow how energy becomes dispersed within a system.
Their shared units arise because both relate energy to temperature, but their meanings differ. Heat capacity describes how much energy is associated with a temperature change through C = δQ/dT. Entropy change instead follows reversible heat transfer through dS = δQrev/T. Consequently, J/K can describe either thermal energy storage or thermodynamic energy dispersal.
Statistical mechanics supplies a microscopic context for macroscopic entropy. It connects the measured thermodynamic quantity to the system's microscopic states, while thermodynamics describes the observable energy and temperature relationships. This connection helps physicists interpret entropy measurements as more than numerical values, linking large-scale thermal behavior with underlying microscopic possibilities.
In calorimetry, quantities expressed in J/K help characterize how a material stores thermal energy as its temperature changes. The heat-capacity relation C = δQ/dT provides the relevant connection between transferred energy and temperature variation. Such measurements allow physicists to compare thermal behavior among materials and analyze thermal systems quantitatively.
The expression dS = δQrev/T specifically uses reversible heat transfer, so the reversible condition is part of the entropy calculation rather than an optional detail. Keeping that condition explicit prevents the relation from being applied without regard to the process described. This distinction supports consistent thermodynamic analyses of materials, phase changes, and thermal systems.
J/K measurements provide a common scale for tracking entropy and heat-capacity behavior in systems undergoing significant thermal changes. In studies of phase changes, they help characterize how the system stores or disperses energy. In engine analysis, the same units support thermodynamic accounting of heat-related changes and energy dispersal across the thermal system.
The unit links several levels of thermal analysis. At the experimental level, calorimetry measures how materials store energy. At the thermodynamic level, entropy calculations track energy dispersal during heat transfer. At the statistical-mechanical level, entropy connects those observations with microscopic states. Together, these uses make J/K relevant to materials, phase changes, engines, and thermal systems.