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関連する概念動画

Glassware Calibration01:11

Glassware Calibration

Accurate calibration of glassware, such as volumetric flasks, pipettes, and burettes, is essential to ensure accurate measurements in the analytical laboratory. Calibration helps maintain consistency across measurements and prevents errors arising from inaccurate volumes.
Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...
Instrument Calibration01:12

Instrument Calibration

Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
Analytical Balance Calibration
An analytical balance measures mass and requires regular calibration to...
Constant Pressure Calorimetry03:02

Constant Pressure Calorimetry

Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...
Calorimetry01:19

Calorimetry

When objects at different temperatures are placed in contact with each other but isolated from everything else, they attain thermal equilibrium. A container that prevents heat transfer in or out is called a calorimeter, and the use of a calorimeter to make measurements is called calorimetry. Generally, these measurements involve heat or specific heat capacity. The term "calorimetry problem" is used for any problem where the specified objects are thermally isolated from their surroundings. An...
Constant Volume Calorimetry02:41

Constant Volume Calorimetry

Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at constant (atmospheric) pressure and are convenient to measure heat flow (or enthalpy change) accompanying processes that occur in solution at constant pressure. A different type of calorimeter that operates at constant volume, colloquially known as a bomb calorimeter, is used to measure the energy produced by reactions that yield large amounts of heat and...
Gas Thermometers and the Kelvin Scale01:22

Gas Thermometers and the Kelvin Scale

The definition of temperature in terms of molecular motion suggests that there should be a lowest possible temperature, where the average kinetic energy of molecules is zero (or the minimum allowed by quantum mechanics). Experiments confirm the existence of such a temperature, called absolute zero. An absolute temperature scale is one whose zero point is absolute zero. Such scales are convenient in science because several physical quantities, such as the volume of an ideal gas, are directly...

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関連する実験動画

Updated: Jun 15, 2026

A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements
06:06

A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements

Published on: July 19, 2016

クリオゲニアンの校正

Francis A Macdonald1, Mark D Schmitz, James L Crowley

  • 1Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA. fmacdon@fas.harvard.edu

Science (New York, N.Y.)
|March 6, 2010
PubMed
まとめ
この要約は機械生成です。

カナダのネオプロテロゾーイク時代の岩石の正確な年代測定は,ストルティア氷河期が世界中で起こったことを明らかにしています. この発見は,炭素循環の大規模なシフトと微生物化石の変化を,地球規模の氷床の発生と関連づけています.

さらに関連する動画

Cryogenic Liquid Jets for High Repetition Rate Discovery Science
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Cryogenic Liquid Jets for High Repetition Rate Discovery Science

Published on: May 9, 2020

Measuring the Densities of Aqueous Glasses at Cryogenic Temperatures
09:50

Measuring the Densities of Aqueous Glasses at Cryogenic Temperatures

Published on: June 28, 2017

関連する実験動画

Last Updated: Jun 15, 2026

A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements
06:06

A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements

Published on: July 19, 2016

Cryogenic Liquid Jets for High Repetition Rate Discovery Science
08:34

Cryogenic Liquid Jets for High Repetition Rate Discovery Science

Published on: May 9, 2020

Measuring the Densities of Aqueous Glasses at Cryogenic Temperatures
09:50

Measuring the Densities of Aqueous Glasses at Cryogenic Temperatures

Published on: June 28, 2017

科学分野:

  • 地質学 地質学 地質学
  • パレオントロジー・パレオントロジー
  • 古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは

背景:

  • ネオプロテロゾーイク時代は,環境と生物学の大きな変化を遂げました.
  • この期間の正確な年齢制限は限られており,統合された分析を妨げています.

研究 の 目的:

  • カナダ北西部のネオプロテロゾーイク時代の岩石の高精度U-Pb年齢制約を提供する.
  • この時代の地質学,古気候学,生物学的出来事を関連付けるために.

主な方法:

  • 高精度のウラン-鉛 (U-Pb) ジオクロノロジーは,火山タフ層の年代測定に使用されました.
  • パレオマグネティックデータを分析して,パレオ緯度を決定しました.

主要な成果:

  • 4つの新しいU-Pb年齢は,ネオプロテロゾーイク層の正確な制約を提供します.
  • 7億1650万年前の火山のタフは,ストルティアン氷河期と同期しています.
  • この年齢は,フランクリン大火山地帯と,ローレンシアの赤道古地位置と一致しています.

結論:

  • ストルティア氷河期は地球規模で,氷河は海面以下で,低地平線で氷が接地していた.
  • 新しい年齢の制約は,炭素循環の混乱,微生物化石の変化,氷河化の記録を統合するのに役立ちます.