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Related Concept Videos

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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Repeated snowball-hothouse cycles within the Neoproterozoic Sturtian glaciation.

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Related Experiment Video

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

Calibrating the Cryogenian.

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
Summary
This summary is machine-generated.

Precise dating of Neoproterozoic rocks in Canada reveals the Sturtian glaciation occurred globally. This finding links major carbon cycle shifts and microfossil changes to the onset of global ice cover.

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Last Updated: Jun 15, 2026

A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements
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Published on: July 19, 2016

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Measuring the Densities of Aqueous Glasses at Cryogenic Temperatures
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Published on: June 28, 2017

Area of Science:

  • Geology
  • Paleontology
  • Paleoclimatology

Background:

  • The Neoproterozoic era saw significant environmental and biological shifts.
  • Precise age constraints for this period are limited, hindering integrated analysis.

Purpose of the Study:

  • To provide high-precision U-Pb age constraints for Neoproterozoic rocks in northwestern Canada.
  • To correlate geological, paleoclimatic, and biological events during this era.

Main Methods:

  • High-precision Uranium-Lead (U-Pb) geochronology was used to date volcanic tuff layers.
  • Paleomagnetic data were analyzed to determine paleolatitudes.

Main Results:

  • Four new U-Pb ages provide precise constraints on Neoproterozoic strata.
  • A volcanic tuff dated at 716.5 million years ago is synchronous with the Sturtian glaciation.
  • This age aligns with the Franklin large igneous province and equatorial paleoposition of Laurentia.

Conclusions:

  • The Sturtian glaciation was global, with ice grounded below sea level at low paleolatitudes.
  • New age constraints help integrate records of carbon cycle perturbations, microfossil changes, and glaciation.