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Mass and Weight

Mass and Weight

Mass and weight are often used interchangeably in everyday conversation. For example, medical records often show our weight in kilograms, but never in the correct units of newtons. In physics, however, there is an important distinction. Weight is the pull of the Earth on an object. It depends on the distance from the center of the Earth. Weight dramatically varies if we leave the Earth's surface, unlike mass, which does not vary with location. On the Moon, for example, the acceleration due to...

Mass and Weight

Mass and Weight

Mass and weight are often used interchangeably in everyday conversation. For example, medical records often show our weight in kilograms, but never in the correct units of newtons. In physics, however, there is an important distinction. Weight is the pull of the Earth on an object. It depends on the distance from the center of the Earth. Weight dramatically varies if we leave the Earth's surface, unlike mass, which does not vary with location. On the Moon, for example, the acceleration due to...

Apparent Weight

Apparent Weight

True weight is the measure of the gravitational force acting on an object. However, if the object accelerates, its measured weight is different from its true weight. Similar observations can be made when the object is submerged in water. An object's weight in water is its apparent weight, which is equal to the difference between its true weight and the buoyant forces.
Consider a person standing on a bathroom scale inside an elevator. If the scale is accurate at rest, its reading equals the...

Weighted Mean

Weighted Mean

While taking the arithmetic, geometric, or harmonic mean of a sample data set, equal importance is assigned to all the data points. However, all the values may not always be equally important in some data sets. An intrinsic bias might make it more important to give more weightage to specific values over others.
For example, consider the number of goals scored in the matches of a tournament. While computing the average number of goals scored in the tournament, it may be more important to...

Specific Gravity of Aggregate

Specific Gravity of Aggregate

Aggregates typically contain pores, which can be either permeable or impermeable. Considering the pores in the aggregates, the specific gravity of aggregates is defined in three different forms, namely, bulk or gross specific gravity, apparent specific gravity, and absolute specific gravity.
Bulk or gross specific gravity is calculated by taking the ratio of the mass of aggregates in the saturated surface-dry state to the total volume that includes both the solids and the voids within the...

Bulk Density of Aggregate

Bulk Density of Aggregate

Bulk density refers to the mass of aggregate particles that would fill a unit volume. The concept of bulk density originates from the inability to pack aggregate particles in a manner that completely eliminates void spaces. Hence, the term bulk refers to the volume that encompasses both the aggregates and the voids. This measurement is crucial when aggregates are batched by volume and is used to convert quantities by mass to volume.
Most natural mineral aggregates, like sand and gravel,...

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Related Experiment Video

Updated: Jun 27, 2026

Exploring the Longissimus Muscle: Unraveling its Correlation with Meat Quality in Bos indicus and Crossbred Bulls

Exploring the Longissimus Muscle: Unraveling its Correlation with Meat Quality in Bos indicus and Crossbred Bulls

Published on: July 12, 2024

A fresh look at dry weight.

Jochen Raimann¹, Li Liu, Sudhi Tyagi

¹Renal Research Institute, New York, New York, USA.

Hemodialysis International. International Symposium on Home Hemodialysis

|December 19, 2008

Summary

This summary is machine-generated.

Achieving dry weight (DW) in dialysis is crucial. This involves managing extracellular volume (ECV) and using advanced methods like bioimpedance for accurate diagnosis to prevent complications.

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Area of Science:

Nephrology
Physiology
Biomedical Engineering

Background:

Dry weight (DW) is critical in dialysis, often defined by patient hypotension, but a physiological extracellular volume (ECV) definition is more rigorous.
Renal failure leads to sodium accumulation, increasing ECV, blood pressure, and risks of cardiovascular and cerebrovascular diseases.
Endogenous digitalis-like factors released during ECV expansion add complexity to understanding fluid balance.

Purpose of the Study:

To explore the physiological definition of dry weight (DW) based on extracellular volume (ECV).
To discuss the mechanisms of fluid removal during dialysis, including ultrafiltration and proposed lymphatic contributions.
To highlight methods for assessing DW, including emerging technologies.

Main Methods:

Review of physiological principles of extracellular volume regulation.
Discussion of sodium balance and its impact on fluid status in renal failure.
Evaluation of ultrafiltration dynamics and plasma refilling during dialysis.
Introduction of continuous segmental calf bioimpedance as a diagnostic tool.

Main Results:

A precise definition of DW relates to a physiological ECV, distinct from symptom-based hypotension.
Sodium retention significantly contributes to overhydration in dialysis patients.
Ultrafiltration and potentially increased lymphatic flow aid in fluid removal and plasma refilling.
Continuous segmental calf bioimpedance shows promise for intradialytic DW assessment.

Conclusions:

Accurate dry weight management is essential for dialysis patients, focusing on achieving physiological extracellular volume.
Understanding fluid dynamics, including lymphatic contributions, is key to optimizing dialysis therapy.
Advanced technologies like bioimpedance offer new avenues for precise intradialytic dry weight monitoring.