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相关概念视频

Hess's Law03:40

Hess's Law

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There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other experimentally determined enthalpy changes. Some reactions are difficult, if not impossible, to investigate and make accurate measurements for experimentally. And even when a reaction is not hard to perform or measure, it is convenient to be able to determine the heat involved in a reaction without having to perform an experiment.
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Energy Budgets00:51

Energy Budgets

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Organisms must balance energy intake with the energy required for growth, maintenance and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species, like annual plants, have only one reproductive episode in their lifetimes and consequently have short lifespans. Iteroparous species, by contrast, have many reproductive events during their lifetimes but have relatively few offspring. These two...
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The Water Cycle01:00

The Water Cycle

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The Earth’s hydrosphere includes all of the areas where the storage and movement of water occurs. Since water is the basis of all living processes, the cycling of water is extremely important to ecosystem dynamics.
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Hydrogen Bonds00:26

Hydrogen Bonds

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Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
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Hydrogen Bonds01:04

Hydrogen Bonds

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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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Escape Velocities of Gases01:19

Escape Velocities of Gases

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To escape the Earth's gravity, an object near the top of the atmosphere at an altitude of 100 km must travel away from Earth at 11.1 km/s. This speed is called the escape velocity. The temperature at which gas molecules attain the rms speed, which is equal to the escape velocity, can be estimated by using the equation for the average kinetic energy of the gas molecules. According to the kinetic theory of gas, the average kinetic energy of the gas molecules is proportional to its...
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相关实验视频

Updated: Jan 8, 2026

A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions
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A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions

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全球气预算

Zutao Ouyang1,2, Robert B Jackson3,4,5, Marielle Saunois6

  • 1Department of Earth System Science, Stanford University, Stanford, CA, USA.

Nature
|December 17, 2025
PubMed
概括
此摘要是机器生成的。

(H2) 对于脱碳至关重要,但也对气候产生影响. 这项研究量化了H2来源,水槽及其变暖效应,揭示了从2010年到2020年间的0.02°C升温.

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Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
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相关实验视频

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Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
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科学领域:

  • 大气化学与气候科学
  • 环境科学与可持续发展
  • 能源政策与减缓气候变化

背景情况:

  • (H2) 被提议作为脱碳的关键能量载体.
  • 然而,H2的间接全球变暖潜力需要对其大气相互作用进行彻底了解.
  • 人们担心扩大H2经济对气候的影响.

研究的目的:

  • 分析从1990年到2020年的全球H2来源和沉积点.
  • 为2010-2020年建立一个全面的半年预算.
  • 评估气体H2上升对全球表面空气温度的影响 (GSAT).

主要方法:

  • 分析了全球H2来源和下沉的趋势,
  • 为2010-2020年期间制定详细的下半年预算.
  • 归因于大气H2增加的GSAT变化的估计.

主要成果:

  • 由于甲氧化,挥发性有机化合物,固定和H2生产泄漏,全球H2来源和沉积点在1990-2020年间增加.
  • 2010-2020年估计的平均H2来源和沉积点分别为69.9±9.4 Tg/年和68.4±18.1 Tg/年.
  • 2010年至2020年间大气中H2的升高导致GSAT升高0.02±0.006°C.

结论:

  • 为了管理与未来经济相关的环境风险,一个全面的预算至关重要.
  • 区域分析显示非洲和南美洲是主要的H2源/沉积中心,而东亚和北美则是化石燃料排放的领先地区.
  • 未来的GSAT影响预计将保持温和 (0.01-0.05°C),但取决于H2的使用,泄漏和甲排放.