What is essential body fat?

What is essential body fat? Essential fat is the minimal amount of fat necessary for normal physiological function. For males and females, essential fat values are typically considered to be 3% and 12%, respectively. Fat above the minimal amount is referred to as nonessential fat. What is the function of essential body fat? Essential fat […]

How many types of N95 masks are there?

How many types of N95 masks are there? The N95 respirator is the most common of the seven types of particulate filtering facepiece respirators. This product filters at least 95% of airborne particles but is not resistant to oil. This web page provides a table of NIOSH-approved N95 respirators, listed alphabetically by manufacturer. What are […]

How can entropy be reduced?

How can entropy be reduced? When a small amount of heat ΔQ is added to a substance at temperature T, without changing its temperature appreciably, the entropy of the substance changes by ΔS = ΔQ/T. When heat is removed, the entropy decreases, when heat is added the entropy increases. Entropy has units of Joules per […]

Why is organic farming better?

Why is organic farming better? Organic farming tends to be better for the environment. Organic farming practices may reduce pollution, conserve water, reduce soil erosion, increase soil fertility, and use less energy. Farming without synthetic pesticides is also better for nearby birds and animals as well as people who live close to farms. Are organic […]

What are the different mechanisms for diffusion?

What are the different mechanisms for diffusion? Diffusion can occur by two different mechanisms: interstitial diffusion and substitutional diffusion. Picture an impurity atom in an otherwise perfect structure. Which diffusion mechanism is faster interstitial or vacancy? Interstitial diffusion is generally faster than vacancy diffusion because bonding of interstitials to the surrounding atoms is normally weaker […]

What type of current is used in arc welding?

What type of current is used in arc welding? Both direct current (D.C.) and alternating current (A.C.) are used for arc welding. The alternating current for arc is obtained from a step down transformer. The transformer receives current from the main supply at 220 to 440 volts and step down to required voltage i.e., 80 […]

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