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関連する概念動画

States of Water01:23

States of Water

Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
Rocket Propulsion In Empty Space - II01:12

Rocket Propulsion In Empty Space - II

The motion of a rocket is governed by the conservation of momentum principle. A rocket's momentum changes by the same amount (with the opposite sign) as the ejected gases. As time goes by, the rocket's mass (which includes the mass of the remaining fuel) continuously decreases, and its velocity increases. Therefore, the principle of conservation of momentum is used to explain the dynamics of a rocket's motion. The ideal rocket equation gives the change in velocity that a rocket experiences by...
Increased Body Temperature01:25

Increased Body Temperature

A body temperature above  38°C  (100.4 °F) is known as fever or pyrexia, and a person with fever is termed 'febrile.' Typically, the hypothalamus, a part of the brain that acts as the body's thermostat, regulates body temperature through a thermoregulatory setpoint. It receives signals from cold and warm thermal receptors throughout the body and adjusts the body's temperature accordingly. Fever occurs when this hypothalamic setpoint is altered, usually in response to an infection or illness.
Signs of Puberty01:27

Signs of Puberty

Puberty is a critical phase, typically beginning between the ages of 8 and 13 in girls and 9 and 14 in boys, though timing can vary based on genetics, environmental factors, and overall health. This period is characterized by the development of secondary sexual characteristics and the attainment of reproductive potential. Endocrine changes underpin puberty, with hormonal surges of Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH) instigated by Gonadotropin-Releasing Hormone (GnRH)...
Carbonation Shrinkage01:24

Carbonation Shrinkage

Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction facilitates the...
Sulfur Assimilation01:20

Sulfur Assimilation

Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to become...

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関連する実験動画

Updated: Jul 19, 2026

Simulation of the Planetary Interior Differentiation Processes in the Laboratory
06:04

Simulation of the Planetary Interior Differentiation Processes in the Laboratory

Published on: November 15, 2013

湿った,若い火星が浮上しています.

R A Kerr

    Science (New York, N.Y.)
    |August 19, 2000
    PubMed
    まとめ

    最近の証拠によると,水はまだ火星に存在している可能性があります. 火星の隕石と火星グローバルサーベイヤー (MGS) の画像の分析は,最近の水活動の兆候を明らかにし,おそらく現在も進行中です.

    科学分野:

    • 惑星科学は惑星科学である.
    • 地質学 地質学 地質学
    • 天体生物学 アストロバイオロジー

    背景:

    • 歴史的に見て,火星に液体の水が存在することは,近年の地質学的な時代ではありえないと考えられてきました.
    • 火星の隕石と火星グローバルサーベイヤー (MGS) ミッションからの新しいデータは,長年にわたるこの信念に異議を唱える.
    • 火星で現在の水活動の可能性は,地球外生命の探求に重大な影響を及ぼします.

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    Thermocapillary Convection Space Experiment on the SJ-10 Recoverable Satellite
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    Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment
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    Last Updated: Jul 19, 2026

    Simulation of the Planetary Interior Differentiation Processes in the Laboratory
    06:04

    Simulation of the Planetary Interior Differentiation Processes in the Laboratory

    Published on: November 15, 2013

    Thermocapillary Convection Space Experiment on the SJ-10 Recoverable Satellite
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    Thermocapillary Convection Space Experiment on the SJ-10 Recoverable Satellite

    Published on: March 11, 2020

    Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment
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    Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment

    Published on: February 27, 2021