関連する実験動画

Updated: Feb 3, 2026

Standardized Method for Measuring Collection Efficiency from Wipe-sampling of Trace Explosives
07:22

Standardized Method for Measuring Collection Efficiency from Wipe-sampling of Trace Explosives

Published on: April 10, 2017

9.9K

標準サイレンの 2% のハッブル定数測定は5年以内に

Hsin-Yu Chen1,2, Maya Fishbach3, Daniel E Holz3,4,5

  • 1Black Hole Initiative, Harvard University, Cambridge, MA, USA. hsinyuchen@fas.harvard.edu.

Nature
|October 19, 2018
PubMed
まとめ

宇宙の膨張速度である ハッブル定数を 測る新しい方法を提供します LIGOとVirgoによる将来の検出は この測定を精密にし 宇宙の膨張の不一致を 解明するのに役立ちます

さらに関連する動画

A Standardized Method for Measurement of Elbow Kinesthesia07:56

A Standardized Method for Measurement of Elbow Kinesthesia

Published on: October 10, 2020

7.9K
Author Spotlight: Unveiling the Molecular Basis of Pain Perception and Neuropathic Pain05:28

Author Spotlight: Unveiling the Molecular Basis of Pain Perception and Neuropathic Pain

Published on: August 9, 2024

1.7K

関連する概念動画

Measurement: Standard Units03:38

Measurement: Standard Units

Every measurement provides three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the measurement (a unit), and an indication of the uncertainty of the measurement. While the number and unit are explicitly represented when a quantity is written, the uncertainty is an aspect of the errors in the measurement results.
79.9K
Units and Standards of Measurement01:10

Units and Standards of Measurement

A physical quantity is defined either by specifying its measurement method or by stating how it is calculated from other measurements. For example, consider a metallic cube. We might define its mass and dimensions by specifying methods for measuring them, such as using a weighing machine and a meter scale. Then, we could define the volume by stating that it is the cube of its side, and we could calculate the density as the mass divided by the volume.
Measurements of physical quantities are...
45.1K
Bond Polarity, Dipole Moment, and Percent Ionic Character02:48

Bond Polarity, Dipole Moment, and Percent Ionic Character

Bond Polarity
35.6K
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...
97.7K
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...
30.8K
Standard Enthalpy of Formation02:37

Standard Enthalpy of Formation

Enthalpy changes are typically tabulated for reactions in which both the reactants and products are at the same conditions. A standard state is a commonly accepted set of conditions used as a reference point for the determination of properties under other different conditions. For chemists, the IUPAC standard state refers to materials under a pressure of 1 bar and solutions at 1 M and does not specify a temperature. Many thermochemical tables list values with a standard state of 1 atm. Because...
49.2K