What are the 4 acceptable thawing methods? There are four acceptable methods for thawing food: in a refrigerator, under cold running water, in a microwave, or as part of the cooking process. How is defrosting done? The defrost mechanism in a refrigerator heats the cooling element (evaporator coil) for a short period of time and […]
What is SAE 1020 steel?
What is SAE 1020 steel? AISI 1020 has low hardenability properties and is a low tensile carbon steel with a Brinell hardness of 119 – 235, and a tensile strength of 410-790 MPa. It has high machinability, high strength, high ductility and good weldability. It is normally used in turned and polished or a cold […]
Can two contradictory statements be false?
Can two contradictory statements be false? The textbook definition says contradictory statements can be neither both true nor both false. Given a contradiction, once you prove that one is false, you have already proved that the other is true. Contrary statements, by definition, cannot both be true, while they can be but are not necessarily […]
What is entropy in thermodynamics?
What is entropy in thermodynamics? Entropy, the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work. Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder, or randomness, of a system. Can entropy increase in a closed system? […]
What does analogRead return?
What does analogRead return? The microcontroller of the board has a circuit inside called an analog-to-digital converter or ADC that reads this changing voltage and converts it to a number between 0 and 1023. In between, analogRead() returns a number between 0 and 1023 that is proportional to the amount of voltage being applied to […]
What are the different modes of heat transfer explain?
What are the different modes of heat transfer explain? Heat flows across temperature differences. There are three modes of heat transfer: conduction, radiation, and convection. Conduction and radiation are fundamental physical mechanisms, while convection is really conduction as affected by fluid flow. What is the difference between conduction and convection name one medium in each […]
What does annealing temperature depend on?
What does annealing temperature depend on? The annealing temperature of a standard PCR protocol is either 55°C [2, 3] or 60°C [4]. The chosen temperature depends on the strand-melting temperature of the primers and the desired specificity. For greater stringency higher temperatures are recommended [2]. Why do different primers require different annealing temperatures? In lower […]
Why is it necessary to wear masks during the COVID-19 pandemic?
Why is it necessary to wear masks during the COVID-19 pandemic? Masks are recommended as a simple barrier to help prevent respiratory droplets from traveling into the air and onto other people when the person wearing the mask coughs, sneezes, talks, or raises their voice. This is called source control. If everyone wears a mask […]
Which way do gears turn?
Which way do gears turn? Change direction: When two gears mesh together, the second one always turns in the opposite direction. So if the first one turns clockwise, the second one must turn counterclockwise. You can also use specially shaped gears to make the power of a machine turn through an angle. Which way does […]