Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Measurement of Fluid Pressure01:16

Measurement of Fluid Pressure

582
Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
A basic form of manometer is the piezometer, a vertical tube open at the top and filled with the same...
582
Pressure Gauges01:20

Pressure Gauges

5.1K
Most pressure gauges, like those on scuba tanks, are calibrated to read zero at atmospheric pressure. Readings from such gauges are called the gauge pressure, which is the pressure relative to atmospheric pressure. When the pressure inside the tank exceeds atmospheric pressure, the gauge reports a positive value. Some gauges are designed to measure negative pressure. For example, many physics experiments must take place in a vacuum chamber, a rigid chamber from which some of the air is pumped...
5.1K
Definition and Measurement of Pressure: Atmospheric Pressure, Barometer, and Manometer02:57

Definition and Measurement of Pressure: Atmospheric Pressure, Barometer, and Manometer

42.6K
Gas pressure is caused by force exerted by gas molecules colliding with the surfaces of objects. Although the force of each collision is very small, any surface of an appreciable area experiences a large number of collisions in a short time, which can result in high pressure.
42.6K
Variation of Atmospheric Pressure01:18

Variation of Atmospheric Pressure

4.1K
Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the decreasing gravitational force per unit area as we move away from the surface of the earth.
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...
4.1K
Constant Pressure Calorimetry03:02

Constant Pressure Calorimetry

97.2K
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...
97.2K
Uncertainty in Measurement: Reading Instruments02:46

Uncertainty in Measurement: Reading Instruments

50.3K
Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process. Such measurements result in exact numbers. By counting the eggs in a carton, for instance, one can determine exactly how many eggs are there in the carton. Similarly, the numbers of defined quantities are also exact. For example, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilograms. Quantities...
50.3K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Novel H<sub>2</sub> colourimetric indicator for screening the activity of H<sub>2</sub>-generating bacteria and measuring their total viable count (TVC).

The Analyst·2026
Same author

Ammonia colourimetric indicator for measuring urease and ureolytic bacteria concentrations.

Biosensors & bioelectronics·2025
Same author

Early wound infection monitoring via headspace O<sub>2</sub> micro-respirometry.

Biosensors & bioelectronics·2024
Same author

An Interprofessional Team for Disease-Modifying Therapy in Alzheimer Disease Implementation.

Neurology. Clinical practice·2024
Same author

Bracing Adolescent Idiopathic Scoliosis (BASIS) study - night-time versus full-time bracing in adolescent idiopathic scoliosis: study protocol for a multicentre, randomized controlled trial.

Bone & joint open·2023
Same author

Photoinduced absorption spectroscopy (PIAS) study of water and chloride oxidation by a WO<sub>3</sub> photoanode in acidic solution.

Physical chemistry chemical physics : PCCP·2023

Related Experiment Video

Updated: Jan 19, 2026

In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence
07:03

In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence

Published on: June 13, 2020

4.2K

A colourimetric vacuum air-pressure indicator.

Dilidaer Yusufu1, Andrew Mills

  • 1Department of Chemistry and Chemical Engineering, Queens University Belfast, David Keir Building, Stranmillis Road, Belfast, BT9 5AG, UK. andrew.mills@qub.ac.uk.

The Analyst
|September 26, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a novel colorimetric indicator for vacuum air pressure, utilizing ortho-cresolphthalein dye. This inexpensive, ink-based sensor accurately detects low carbon dioxide levels, crucial for food packaging integrity.

More Related Videos

Measurement of the Pressure-volume Curve in Mouse Lungs
09:49

Measurement of the Pressure-volume Curve in Mouse Lungs

Published on: January 27, 2015

19.4K
A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System
10:27

A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System

Published on: June 12, 2019

9.1K

Related Experiment Videos

Last Updated: Jan 19, 2026

In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence
07:03

In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence

Published on: June 13, 2020

4.2K
Measurement of the Pressure-volume Curve in Mouse Lungs
09:49

Measurement of the Pressure-volume Curve in Mouse Lungs

Published on: January 27, 2015

19.4K
A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System
10:27

A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System

Published on: June 12, 2019

9.1K

Area of Science:

  • Chemical Sensing
  • Materials Science
  • Food Packaging Technology

Background:

  • Accurate monitoring of vacuum air pressure is critical for food packaging integrity.
  • Existing methods for pressure monitoring can be complex or costly.
  • Low levels of carbon dioxide (CO2) in packaging can indicate compromised seals.

Purpose of the Study:

  • To develop an inexpensive, colorimetric indicator for vacuum air pressure.
  • To utilize the pH indicator dye ortho-cresolphthalein (OCP) for CO2 detection.
  • To assess the indicator's efficacy in food vacuum packaging.

Main Methods:

  • An ink was formulated using OCP, tetrabutylammonium cation, and ethyl cellulose in a non-aqueous solution.
  • The ink was cast and dried to create a colorimetric sensor.
  • Color changes were analyzed qualitatively and quantitatively (using digital photography and RGB analysis).
  • Response to CO2 levels and temperature sensitivity were measured.

Main Results:

  • The indicator responds to CO2 levels below 0.041%, with a halfway color change point at 0.062 atm at 22 °C.
  • The sensor demonstrated effective vacuum-package integrity indication for food packaging.
  • Response and recovery times were measured at 16.2 and 2.7 minutes, respectively.
  • The indicator's response is temperature sensitive (ΔH = 78 ± 5 kJ mol⁻¹).

Conclusions:

  • An innovative, ink-based colorimetric vacuum air pressure indicator has been developed.
  • The indicator offers a cost-effective solution for monitoring vacuum levels in food packaging.
  • This represents the first reported example of such an inexpensive, ink-based sensor.