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Related Concept Videos

Quality of Water01:19

Quality of Water

In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
Waterproofing and Anti-Bacterial Admixtures in Concrete01:22

Waterproofing and Anti-Bacterial Admixtures in Concrete

Concrete's susceptibility to water absorption is due to the capillary action within the pores of its hydrated cement paste. This action draws water in, creating the need for waterproofing admixtures to prevent such penetration. The efficacy of these admixtures is contingent upon the water pressure, with variations arising from different conditions such as rain, capillary rise, or hydrostatic pressure in structures intended to hold water.
Waterproofing admixtures render concrete hydrophobic,...
Factors Affecting Solubility04:01

Factors Affecting Solubility

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
Drug Regulation01:25

Drug Regulation

Drug regulation encompasses the management of drug usage by evaluating its safety and efficacy through assessments conducted by regulatory authorities. Regrettably, the history of drug regulation is marred by several catastrophic events. One such incident is the Elixir Sulfanilamide tragedy, in which the toxic compound diethyl glycol was included in a sweet-tasting medication, leading to numerous fatalities. This event prompted the enactment of the Food, Drug, and Cosmetic Act in 1938. Under...
Testing Water Quality01:14

Testing Water Quality

When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
Minerals01:26

Minerals

Minerals are essential nutrients that the human body needs in small amounts to work properly. They play a vital role in many bodily functions, such as building strong bones and transmitting nerve impulses. Some minerals are needed for hormone production or to maintain a normal heartbeat. Major minerals include calcium, phosphorus, potassium, sulfur, sodium, chlorine, and magnesium, while trace minerals include iron, manganese, copper, iodine, zinc, cobalt, fluoride, and selenium.

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Related Experiment Video

Updated: Jun 21, 2026

A Small Volume Bioassay to Assess Bacterial/Phytoplankton Co-culture Using WATER-Pulse-Amplitude-Modulated (WATER-PAM) Fluorometry
09:54

A Small Volume Bioassay to Assess Bacterial/Phytoplankton Co-culture Using WATER-Pulse-Amplitude-Modulated (WATER-PAM) Fluorometry

Published on: March 11, 2015

Water fluoridation in Canada: past and present.

Danielle Rabb-Waytowich1

  • 1Canadian Dental Association, 1815 Alta Vista Dr., Ottawa, ON K1G3Y6. library@cda-adc.ca

Journal (Canadian Dental Association)
|July 25, 2009
PubMed
Summary

Water fluoridation in Canada is debated, with supporters citing caries prevention and detractors noting costs and risks. The article reviews its history and current status, concluding fluoridation benefits all socioeconomic groups.

Area of Science:

  • Public Health
  • Epidemiology
  • Dental Health

Background:

  • Water fluoridation is a debated public health measure in Canada.
  • Arguments for and against fluoridation have remained consistent over time.
  • As of 2007, 45.1% of Canadians had access to fluoridated water.

Purpose of the Study:

  • To provide a historical overview of water fluoridation in Canada.
  • To present a current snapshot of water fluoridation practices in Canada.
  • To evaluate the overall benefit of community water fluoridation.

Main Methods:

  • Historical review of water fluoridation policies and debates in Canada.
  • Analysis of current water fluoridation status and population coverage.
  • Synthesis of evidence regarding the efficacy and safety of water fluoridation.

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Last Updated: Jun 21, 2026

A Small Volume Bioassay to Assess Bacterial/Phytoplankton Co-culture Using WATER-Pulse-Amplitude-Modulated (WATER-PAM) Fluorometry
09:54

A Small Volume Bioassay to Assess Bacterial/Phytoplankton Co-culture Using WATER-Pulse-Amplitude-Modulated (WATER-PAM) Fluorometry

Published on: March 11, 2015

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Main Results:

  • Water fluoridation continues to be a contentious issue in Canada.
  • Key arguments for fluoridation include caries prevention, while arguments against cite costs and health concerns.
  • Community water fluoridation offers equitable benefits across socioeconomic statuses.

Conclusions:

  • Water fluoridation is supported by major health organizations as safe and effective for preventing tooth decay.
  • Despite ongoing debate, water fluoridation provides a universal public health benefit.
  • The primary advantage of water fluoridation lies in its ability to improve oral health for everyone in a community, irrespective of their socioeconomic background.