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Related Concept Videos

Gravimetry: Overview01:05

Gravimetry: Overview

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Gravimetric analysis is a quantitative method where the analyte is isolated and weighed directly or after conversion into a substance of known composition. Gravimetric analysis can be classified as precipitation, electrogravimetry, volatilization, and particulate gravimetry, based on the method used to isolate the analyte.
In precipitation gravimetry, the analyte is converted into a precipitate and weighed. For example, the silver content in a sample can be estimated by precipitating and...
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Newton's law of gravitation describes the gravitational force between any two point masses. However, for extended spherical objects like the Earth, the Moon, and other planets, the law holds with an assumption that masses of spherical objects are concentrated at their respective centers.
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Gravitation01:16

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In the years before Newton, a general belief prevailed that different laws governed objects in the sky than objects on Earth. When Kepler wrote down the three laws of planetary motion, explaining in detail the geometrical properties of the planetary orbits around the Sun, there was no immediate idea to discern their connection with more fundamental laws. It was Isaac Newton who, in 1665–66, figured out the connection between planetary motion, the motion of the moon around the Earth, and...
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Gravimetry: Inorganic And Organic Precipitating Agents00:49

Gravimetry: Inorganic And Organic Precipitating Agents

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In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
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Precipitation Gravimetry

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Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
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Tidal Forces

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The origin of Earth's ocean tides has been a subject of continuous investigation for over 2000 years. However, the work of Newton is considered to be the beginning of the proper understanding of the phenomenon. Ocean tides are the result of gravitational tidal forces. These same tidal forces are present in any astronomical body; they are responsible for the internal heat that creates the volcanic activity on Io, one of Jupiter's moons, and the breakup of stars that get too close to...
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Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
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Lunar Megaregolith Structure Revealed by GRAIL Gravity Data.

Kristel Izquierdo1, Michael M Sori1, Jason M Soderblom2

  • 1Department of Earth, Atmospheric, and Planetary Sciences Purdue University West Lafayette IN USA.

Geophysical Research Letters
|July 22, 2022
PubMed
Summary

NASA

Keywords:
BouguerMoonejectagravitymegaregolithporosity

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Area of Science:

  • Lunar geology
  • Planetary science
  • Geophysics

Background:

  • The upper lunar crust's porosity influences its physical properties.
  • Understanding porosity is key to lunar evolution models.

Purpose of the Study:

  • To characterize the porosity structure of the lunar crust.
  • To investigate the relationship between crater size and porosity.

Main Methods:

  • Analysis of gravity data from NASA's GRAIL mission.
  • Examination of gravitational anomalies linked to crater porosity (10-30 km diameter).

Main Results:

  • A significant change in crater gravitational signatures was observed at a specific diameter.
  • This change correlates with a discrete porosity shift at ~3-5 km depth.
  • Identified boundary between basin ejecta and the structurally disturbed crust.

Conclusions:

  • The porosity boundary marks the base of the ejecta layer.
  • Ejecta thickness provides constraints for lunar material transport and heat flow models.
  • The ejecta layer's insulating properties impact models of lunar magmatism.