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Pipe Flowrate Measurement

Pipe Flowrate Measurement

In pipe flow measurement, orifice, nozzle, and Venturi meters are commonly used to determine fluid flowrates by constricting the flow area, which increases fluid velocity and reduces pressure. This pressure difference, governed by Bernoulli's principle and adjusted for real-world conditions, is essential for calculating flowrate. Each meter type is suited to specific applications based on accuracy, efficiency, and compatibility with various flow conditions.
The orifice meter is a simple,...

Measurement: Derived Units

Measurement: Derived Units

The International System of Units or SI system, by international agreement, has fixed measurement units for seven fundamental properties: length, mass, time, temperature, electric current, amount of substance, and luminosity. These are called the SI base units.

Units and Standards of Measurement

Units and Standards of Measurement

A physical quantity is defined either by specifying its measurement method or by stating how it is calculated from other measurements. For example, consider a metallic cube. We might define its mass and dimensions by specifying methods for measuring them, such as using a weighing machine and a meter scale. Then, we could define the volume by stating that it is the cube of its side, and we could calculate the density as the mass divided by the volume.
Measurements of physical quantities are...

Units and Standards of Measurement

Units and Standards of Measurement

A physical quantity is defined either by specifying its measurement method or by stating how it is calculated from other measurements. For example, consider a metallic cube. We might define its mass and dimensions by specifying methods for measuring them, such as using a weighing machine and a meter scale. Then, we could define the volume by stating that it is the cube of its side, and we could calculate the density as the mass divided by the volume.
Measurements of physical quantities are...

Measurement: Standard Units

Measurement: Standard Units

Every measurement provides three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the measurement (a unit), and an indication of the uncertainty of the measurement. While the number and unit are explicitly represented when a quantity is written, the uncertainty is an aspect of the errors in the measurement results.

Distance Measurements by Taping

Distance Measurements by Taping

Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...

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What are meters measuring?

¹Cutest Systems Ltd, 174 Whitchurch Road, Heath, Cardiff, UK.

International Journal of Cosmetic Science

|May 24, 2008

Summary

Manufacturers must link objective skin measurements to consumer perception for effective cosmetic claims. Understanding what devices measure, like transepidermal water loss (TEWL) versus skin hydration, is crucial for product development and marketing.

Area of Science:

Cosmetic science
Dermatology
Biophysical measurements

Background:

Increasing demand for data to substantiate cosmetic product claims.
Human studies are the most reliable source of data for cosmetic claims.
Various biophysical measurement devices exist, but their interpretation requires expertise.

Purpose of the Study:

Clarify the distinction between transepidermal water loss (TEWL) and stratum corneum hydration measurements.
Highlight the importance of understanding what skin physiology meters actually measure.
Emphasize the need to correlate objective measurements with consumer-perceived product benefits.

Main Methods:

Review of biophysical measurement principles, including TEWL and electrical properties (capacitance/conductance) for hydration.

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Discussion of potential disconnect between device-generated data and consumer perception.

Reference to a study comparing perceptual tests with standard volunteer tests for moisturization claims.

Main Results:

Transepidermal water loss (TEWL) measures skin barrier function, not hydration.
Electrical property measurements (capacitance/conductance) can indicate stratum corneum hydration.
Objective increases in water content (e.g., 20%) may not translate to proportional consumer-perceived moisturization.

Conclusions:

Accurate interpretation of biophysical measurements is essential for meaningful cosmetic claims.
A gap exists between technically measurable parameters and consumer-relevant benefits.
Integrating objective testing with perceptual assessments during product development is key for systematic advancement.