Vacuum Level
Vacuum Level - Related Videos
06:20
Proper Operation of Vacuum Based Equipment
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2023
Source: Robert M. Rioux, Ajay Sathe & Zhifeng Chen, Pennsylvania State University, University Park, PA Vacuum is required for a number of laboratory procedures. This is most routinely achieved in the laboratory by the use of vacuum pumps. In addition to working at low pressures, vacuum pumps can also be used to enable rapid changing of the atmospheres in a reactor or flask by evacuation and backfilling.
03:03
Inoculating a Bacterial Pathogen into Arabidopsis Leaves via Vacuum Infiltration
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2026
Source: Rufián, J. S., et.al. Single-Cell Analysis of the Expression of Pseudomonas syringae Genes within the Plant Tissue. J. Vis. Exp. (2022)This video demonstrates a vacuum infiltration method to introduce a bacterial pathogen into Arabidopsis plant leaves. The approach uses a prepared bacterial suspension and vacuum pulses to enable uniform entry through stomata, resulting in controlled leaf infection.
01:19
High-Level and Low-Level Awareness
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2024
Controlled processes in human consciousness represent high-alert mental states where individuals deliberately focus their attention on achieving specific goals. Controlled processes can be seen in situations like mastering new technology, where a person might become so absorbed that they ignore surrounding distractions. Such processes involve selective attention, requiring one to concentrate on particular elements of experience while disregarding others. These are governed by executive...
01:29
Leveling Effect
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2024
In acid-base chemistry, the leveling effect refers to the limitation imposed by the solvent on the strength of acids and bases in solution. When a base stronger than the solvent's conjugate base is used, it deprotonates the solvent until the base is entirely consumed, making it ineffective against weaker acids. Conversely, an acid stronger than the solvent's conjugate acid protonates the solvent until the acid is depleted, rendering it ineffective against weaker bases. Essentially, the solvent...
09:26
How to Build a Vacuum Spring-transport Package for Spinning Rotor Gauges
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Cited by 1 •
2016
Here we describe how to build a robust spring-transport mechanism for a spinning rotor gauge. This device securely immobilizes the rotor and keeps it under vacuum during transportation. We also describe packaging that minimizes the risk of damage during transport. Tests show our design works for typical shocks during transport.
FAQs
The two measurement approaches provide different reference conditions for interpreting pressure. Absolute measurements quantify pressure relative to a fixed zero-pressure reference, while gauge measurements compare the system with atmospheric pressure. This distinction affects how engineers specify equipment, compare readings, and assess whether a process has reached its intended operating condition.
Vacuum sensors do not provide equally useful measurements across all pressure conditions. Absolute gauges, capacitance manometers, and ionization gauges are selected according to the pressure range and process requirements identified for the system. Choosing an unsuitable sensor can reduce the usefulness of control data, making it harder to maintain stable conditions or interpret process performance.
Pumps remove gas from the confined space, but the overall result also depends on seals and construction materials. Seals help prevent unwanted gas entry, while material choices affect the cleanliness and behavior of the gas environment. Engineers therefore evaluate these components together rather than treating the pump as the only factor controlling pressure.
Gas load refers to the amount of gas that the system must remove or continue to manage. A system with a larger gas load places greater demands on its pumping and control arrangement, which can affect pressure stability. Engineers consider this factor when selecting pumps, measurement methods, seals, and materials for consistent process conditions.
A typical approach begins by defining the required pressure range and process conditions. Engineers then select a suitable pump, seals, materials, and pressure sensor, remove gas from the confined space, and monitor the remaining pressure. Comparing the measurement with the intended operating condition supports adjustment and control of the system during operation.
Controlled vacuum conditions support semiconductor fabrication, coating and evaporation, vacuum packaging, thermal processing, and laboratory instrumentation. These applications differ in their pressure requirements, cleanliness needs, and stability demands. Accurate measurement allows engineers to verify that the gas environment is suitable for the intended process and to maintain the required operating conditions.
In semiconductor fabrication and coating or evaporation, the pressure environment must be controlled as part of the process setup. Engineers select sensors and pumping arrangements that fit the required pressure range, gas load, cleanliness, and stability. Reliable readings help determine whether the system is operating within conditions suitable for the intended fabrication or surface-treatment step.
Design decisions should account for the required pressure range, expected gas load, cleanliness, and process stability. The pump, seals, materials, and measurement method must work together to create a controllable gas environment. Selecting components on these criteria helps laboratory instruments obtain pressure information that is appropriate for their operating conditions and experimental requirements.