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Phase Transitions: Sublimation and Deposition02:33

Phase Transitions: Sublimation and Deposition

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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance.
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Acceleration due to Gravity on Other Planets01:24

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The gravitational acceleration of an object near the Earth's surface is called the acceleration due to gravity. It can be measured by conducting simple experiments on Earth. However, such an experiment is impossible to conduct on the surface of other planets.
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Sublimation01:03

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Sublimation is the direct transformation of a solid to a gaseous state. For instance, at standard pressure and room temperature, solid carbon dioxide sublimes to gaseous carbon dioxide. The phase diagram depicts the conditions required for sublimation. This process occurs at the solid-gas phase boundary and is not observed above the triple point of the substance. The reverse of sublimation is called deposition, where a gaseous substance condenses directly into a solid. Sublimation and...
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Precipitation Gravimetry01:03

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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Volatilization

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Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
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Experimental Methods of Dust Charging and Mobilization on Surfaces with Exposure to Ultraviolet Radiation or Plasmas
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Large-scale cryovolcanic resurfacing on Pluto.

Kelsi N Singer1, Oliver L White2, Bernard Schmitt3

  • 1Southwest Research Institute, Boulder, CO, 80302, USA. ksinger@boulder.swri.edu.

Nature Communications
|March 30, 2022
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This summary is machine-generated.

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Area of Science:

  • Planetary Science
  • Geology
  • Astrobiology

Background:

  • New Horizons mission data reveals diverse terrains on Pluto.
  • Pluto exhibits ancient, cratered surfaces alongside geologically young regions.

Purpose of the Study:

  • To analyze the geomorphology and composition of unique hummocky terrains on Pluto.
  • To investigate the processes responsible for resurfacing young regions on Pluto.

Main Methods:

  • Analysis of high-resolution images from the New Horizons spacecraft.
  • Compositional data analysis of Pluto's surface features.

Main Results:

  • Identified unique, massive rises with hummocky flanks in a young region on Pluto.
  • Concluded these features were formed by large-scale cryovolcanic processes, unique to Pluto.
  • Estimated material volume exceeding 10^4 km^3 for dome formation.

Conclusions:

  • Pluto's cryovolcanic activity suggests significant internal heat or enhanced heat retention.
  • These processes mobilized water-ice-rich materials late in Pluto's geological history.
  • The findings challenge previous assumptions about Pluto's internal evolution.