How do you calculate atmospheric stability? Stability is determined by comparing the temperature of a rising or sinking air parcel to the environmental air temperature. Imagine the following: at some initial time, an air parcel has the same temperature and pressure as its environment. What is the relationship between atmospheric stability and temperature? A stable […]
How do you calculate the heat transfer coefficient of a heat exchanger?
How do you calculate the heat transfer coefficient of a heat exchanger? Composition = the overall heat transfer coefficient (W/(m2•K)) = the contact area for each fluid side (m2) (with and expressing either surface) = the thermal conductivity of the material (W/(m·K)) = the individual convection heat transfer coefficient for each fluid (W/(m2•K)) = the […]
What were machines powered by during the Industrial Revolution?
What were machines powered by during the Industrial Revolution? The steam engine helped to power the Industrial Revolution. Before steam power, most factories and mills were powered by water, wind, horse, or man. Water was a good source of power, but factories had to be located near a river. What tools were used in the […]
How do you finish PLA prints?
How do you finish PLA prints? The technique to polish your prints is simple. Get a soft cotton cloth, and apply a small amount of liquid polish. Then apply to your 3D print surface in small circles until all the polish is rubbed into the surface. Once you’ve finished that, the surface should look reasonably […]
What does 95 percent compaction mean?
What does 95 percent compaction mean? 95% compaction means that the soil on the construction site has been compacted to 95% of the maximum density achieved in the lab. How do you calculate soil compaction percentage? 3.7 Calculate percent relative compaction by dividing the dry density of the material from the test site by that […]
What did the space probe Rosetta do?
What did the space probe Rosetta do? Rosetta was the first spacecraft to fly close to Jupiter’s orbit using solar cells as its main power source. Rosetta was the first spacecraft to orbit a comet nucleus, and was the first spacecraft to fly alongside a comet as it headed towards the inner Solar System. What […]
Which is stronger LDPE or HDPE?
Which is stronger LDPE or HDPE? LDPE is softer, more flexible and melts at a lower temperature than HDPE. LDPE is used in sandwich bags and other types of packaging. HDPE is harder, has a higher chemical resistance and can withstand higher temperatures. What is the difference between HDPE Lldpe and LDPE? This gives LLDPE […]
Why is material selection important in the process of design?
Why is material selection important in the process of design? When it comes to material selection, design engineers you hire for your projects will more than likely have certain specific factors they look for as well. The fact is, material selection is very important because engineers have to plan for any potential consequences that certain […]
What does it mean when assets decrease?
What does it mean when assets decrease? Current Assets A decrease in an asset is offset by either an increase in another asset, a decrease in a liability or equity account, or an increase in an expense. An example of the first is an inventory purchase. Cash decreases while inventory increases. An example of the […]
What is a thermal radiator?
What is a thermal radiator? Thermal radiators are heat exchangers designed to transfer thermal energy from one medium to another for the purpose of space heating. Is an incandescent light bulb a thermal radiator? Approximately 90% of the power consumed by an incandescent light bulb is emitted as heat, rather than as visible light. So, […]