What is the molarity of a 0.9% NaCl solution? For example, 0.9% NaCl contains 0.9 g NaCl per 100 ml of solution or 9 g NaCl/l. This can be converted to molarity by dividing by molecular weight: 0.9% NaCl = (9g/l)/(58.5g/mole) = 0.15 M NaCl. What concentration of NaCl is isotonic? 0.9% What is the […]
What direct current polarity flows from the electrode across the arc to the work?
What direct current polarity flows from the electrode across the arc to the work? Direct Current Electrode Positive (DCEP): The direction of current flow through a welding circuit when the electrode lead is connected to a positive terminal and the work lead is connected to a negative terminal to a DC welding machine. Also called […]
What is the relationship between velocity boundary layer and thermal boundary layer?
What is the relationship between velocity boundary layer and thermal boundary layer? If the Prandtl number is less than 1, which is the case for air at standard conditions, the thermal boundary layer is thicker than the velocity boundary layer. If the Prandtl number is greater than 1, the thermal boundary layer is thinner than […]
Why is Otto cycle less efficient than Carnot cycle?
Why is Otto cycle less efficient than Carnot cycle? The Otto cycle is more complicated than a Carnot cycle, in a number of ways: This makes the engine less efficient that a Carnot engine, because heat is being discharged at a temperature that is not as cool as the environment. How does the thermal efficiency […]
What are the 4 properties of materials?
What are the 4 properties of materials? The four properties of material are mass, toughness, hardness and malleability. EXPLANATION: Materials occurs in nature according to their compactness. Material are categorized into three common states in which they are present, they are solid liquid and gas. What are the properties of useful materials? Materials are considered […]
How do you calculate the power generated by a wind turbine?
How do you calculate the power generated by a wind turbine? Power output is calculated as follows: power = [(air density) times (swept area of blades) times (wind speed cubed)] divided by 2. The area is in meters squared, air density is in kilograms per meters cubed and wind speed is in meters per second. […]
What is the difference between biomass and fossil fuels?
What is the difference between biomass and fossil fuels? Biomass is biological material derived from living, or recently living organisms. Fossil fuel such as coal, oil and gas are also derived from biological material, however material that absorbed co2 from the atmosphere many millions of years ago. … Does biomass cause global warming? Does biomass […]
What type of reaction is the following C O2 –> CO2?
What type of reaction is the following C O2 –> CO2? Combustion reactions involve the reaction of a substance with oxygen gas (O2). It is often referred to as burning. The products of the reaction are oxides of the elements in the reactants. Hydrocarbon combustion leads to the formation of carbon dioxide gas and water […]
What is the purpose of a ramp?
What is the purpose of a ramp? Ramps are sloped pathways used both inside and outside buildings used to provide access between vertical levels. Ramps provide an alternative to stairs for wheelchair users, people with mobility issues and people with prams, bicycles and other wheeled items. What is called ramp? Ramps (which are sometimes called […]