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What is Weather?01:07

What is Weather?

Overview
Adiabatic Processes for an Ideal Gas01:18

Adiabatic Processes for an Ideal Gas

When an ideal gas is compressed adiabatically, that is, without adding heat, work is done on it, and its temperature increases. In an adiabatic expansion, the gas does work, and its temperature drops. Adiabatic compressions actually occur in the cylinders of a car, where the compressions of the gas-air mixture take place so quickly that there is no time for the mixture to exchange heat with its environment. Nevertheless, because work is done on the mixture during the compression, its...
Pressure and Volume in an Adiabatic Process01:27

Pressure and Volume in an Adiabatic Process

Free expansion of a gas is an adiabatic process. However, there are few differences between free expansion and adiabatic expansion. During free expansion, no work is done, and there is no change in internal energy. But, for an adiabatic expansion, work is done, and there is a change in internal energy. During an adiabatic process, the relation between the pressure and volume is obtained from the condition for the adiabatic process, that is,
Work Done in an Adiabatic Process01:20

Work Done in an Adiabatic Process

Consider the adiabatic compression of an ideal gas in the cylinder of an automobile diesel engine. The gasoline vapor is injected into the cylinder of an automobile engine when the piston is in its expanded position. The temperature, pressure, and volume of the resulting gas-air mixture are 20 °C, 1.00 x 105 N/m2, and 240 cm3 , respectively. The mixture is then compressed adiabatically to a volume of 40 cm3. Note that, in the actual operation of an automobile engine, the compression is not...
Precipitation Processes01:12

Precipitation Processes

The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
Variation of Atmospheric Pressure01:18

Variation of Atmospheric Pressure

Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the decreasing gravitational force per unit area as we move away from the surface of the earth.
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...

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相关实验视频

Updated: Jul 8, 2026

Knowledge Based Cloud FE Simulation of Sheet Metal Forming Processes
11:05

Knowledge Based Cloud FE Simulation of Sheet Metal Forming Processes

Published on: December 13, 2016

大气中人工云的形成.

K O Jayaweera, T Ohtake

    Science (New York, N.Y.)
    |November 3, 1972
    PubMed
    概括
    此摘要是机器生成的。

    人工云是使用干冰在低于零度的超和空气中创建的. 这些云可以通过建立辐射平衡来帮助调节北极温度.

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    Extraction and Characterization of Surfactants from Atmospheric Aerosols
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    Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
    12:11

    Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

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    相关实验视频

    Last Updated: Jul 8, 2026

    Knowledge Based Cloud FE Simulation of Sheet Metal Forming Processes
    11:05

    Knowledge Based Cloud FE Simulation of Sheet Metal Forming Processes

    Published on: December 13, 2016

    Extraction and Characterization of Surfactants from Atmospheric Aerosols
    09:34

    Extraction and Characterization of Surfactants from Atmospheric Aerosols

    Published on: April 21, 2017

    Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
    12:11

    Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

    Published on: April 8, 2020

    科学领域:

    • 大气科学 大气科学
    • 云物理 云物理
    • 气候工程是气候工程.

    背景情况:

    • 在晴朗的天空下,北极地区经历了显著的冷却.
    • 辐射平衡对于保持稳定的表面温度至关重要.
    • 人工云形成为局部气候变化提供了潜在的潜力.

    研究的目的:

    • 为了研究在0°C以下创造人工云的可行性.
    • 探索这些云在调节北极表面温度中的应用.
    • 评估使用人工云来建立辐射平衡的潜力.

    主要方法:

    • 将干冰颗粒引入无云,超和的空气中,温度低于0°C.
    • 在受控的大气条件下观察云形成.
    • 分析人工云的辐射特性.

    主要成果:

    • 在零度以下温度的无云大气中成功形成人造云.
    • 证明干冰可以诱导超和空气中的凝结.
    • 指示辐射平衡建立的潜力.

    结论:

    • 使用干冰的人工云形成是可以实现的.
    • 这些云显示出有望抑制北极表面地区的冷却.
    • 需要进一步的研究来探索气候工程应用.