(可降解)than plastic,but this might be only advantage.The production of cotton requires far more energy,water and so on.As the bags are heavier,transporting them will lead to higher carbon emissions (碳排放) .An article from Columbia University suggests that cotton shopping bags need to be ...
Which is heavier, a given volume of ice, or the same volume of water? Justify your answer. Density: The density of a substance is a derived quantity, comprised of two fundamental quantities: mass and length. The density is mass per unit volume of a substance. I...
A.Let's see our cotton bag. B. The problem is that we often don't. C Surprised?Keep on and we'll explain. D. Do you wonder which should be better? E. It's not just about cotton bags for shopping. F. Producing it can cause harmful gas into the air. 相关知识点: 试题来源:...
A. Planetesimals may remain in star systems when hydrogen and helium combine with less common heavier elements. B. Planetesimals are composed of heavy elements because hydrogen and helium stay in the form of gases. C. Planetesimals are small, solid objects that condense within a forming star syst...
The city used smart water meters to take the place of traditional water meters. They can detect(探测〉water waste and leakage(泄漏)and send data to let the house owner know. The same system is used for other city resources like electricity and natural gas. This way, people know how they...
Different methods can be used to increase the isotopic proportion of U-235. Typically, theyellowcake is converted into a gaseous form, called uranium hexafluoride. This gas is then pumped into fast spinning cylinders — centrifuges — where heavier isotopes, such as U-238, are pushed towards ...
Moreover, while these molecules might stay intact beneath the surface (as they evidently do on asteroids and comets), they probably cannot react with each other unless some kind of liquid or gas is available to move them about. Thus, if we limit our search to worlds on which organic ...
Moreover, while these molecules might stay intact beneath the surface (as they evidently do on asteroids and comets), they probably cannot react with each other unless some kind of liquid or gas is available to move them about. Thus, if we limit our search to worlds on which organic molecu...
A process for the preparation of a gas which can be used instead of natural gas from heavier hydrocarbons as methane and acetylenePATRY MARCEL
Matter that has atoms close together but with an indefinite shape are best classified as: a. solid b. liquid c. homogeneous d. gas e. plasma If the solid form of most molecules is heavier than the liquid form, why does ice float? a...