| 词汇 | helium |
| 释义 | helium noun[ U ] uk /ˈhiː.li.əm/ us /ˈhiː.li.əm/(symbolHe) a chemical element that is a gas lighter than air, that will not burn and is used in balloons, airships, and some types of lights氦 Chemical elements actinium alkali metal americium astatine berkelium brimstone bromine calcium fluorine germanium iodine lithium manganese nickel plutonium quicksilver selenium silicon sodium transition metal But soon, balloonists started to use lighter-than-air gases like helium and hydrogen inside the balloon to fly higher. Hot air balloons are more common, but many of the high altitude balloons use helium gas. The gas used in the balloon is helium, which is not explosive like hydrogen, and therefore not as dangerous. helium | American Dictionaryhelium noun[ U ] us/ˈhi·li·əm/ a gas, one of the chemical elements, that is lighter than air and will not burn Examples of heliumhelium Therefore, the thermodynamic properties of pure hydrogen or helium can be calculated directly with the help of a relatively simple interpolation code. Campers choose the colors that are meaningful to them and counselors blow up helium balloons. Moreover, in models with helium (and other ions) the thermal force in the steep transition region may play a role in determining the coronal abundances. At later times, temperature profiles in the helium case reflect the more complex shock history in the helium interior. Stopping power of dense helium plasma for fast heavy ions. The simulations star t with helium in its ground state at room temperature. It is a helium-neon based, one colour, three beam system, capable of measuring two components of velocity using light polarization for discrimination. Insects were caught in a tapering net suspended several metres below an aerodynamically shaped, helium-filled balloon (blimp) attached to a lightweight motorized winch. A parametric potential for ions from helium to iron isoelectronic sequences. The calculated solutions to the air and helium-sphere problems are, therefore, still applicable. The bottom panel shows the relative abundance of helium ions with respect to the protons. The results may prove to be of some value in a macroscopic model of liquid helium based on hydrodynamical principles. Helium was used as a carrier gas at a constant flow of 0.98 ml/min. The nitrogen and helium gases used in the ejection studies were fed into the model via a pipe within the inflow water pipe. As a result, heavy helium penetrates onward with a fingerlike structure. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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