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Advantages & Disadvantages of Opportunity Sampling

As principal of a high school, you want to know if your students prefer Coca-Cola or Pepsi. You do not have time to ask all 5,000 students their preference, but the English teacher has offered to ask all of his students and let this sample decide for the school. This process is known as opportunity

How to Use a Telescience Telescope

TeleScience offers entry-level telescopes aimed at children and beginner astronomy enthusiasts. These refracting telescopes use the same technology Galileo used to study the stars. The lenses of refracting telescopes collect and magnify the light from distant objects. TeleScience telescopes include

How to Find Lengths of Polygons

Polygons are geometric figures created by intersecting straight line segments, or sides. Common examples are triangles and pentagons. You can find the length of a side assuming you know either the apothem or the radius for the polygon. The apothem is the distance from the polygon's center to the mid

How to Make Stained Glass Pictures

Stained Glass Pictures are beautiful to look at. Modern stained glass uses stained glass paint or glass chips to create the colorful designs. Stained glass from the 1940's is a forgotten art. This style was the original home stained glass project for crafters and was made with watercolor paint and a

How to Determine the Chloride Concentration in an Alkali Solution

Like most nitrates, silver nitrate (AgNO3) dissolves well in water. Silver chloride, however, is highly insoluble. That's why you can use the lab reagent silver nitrate to determine chloride concentration -- the silver ions from the silver nitrate will combine with the chloride ions to form solid si

How to Put a Countdown Clock in an Email

Countdown timers are a way for you to share a special occasion with your friends and family. Whether you are getting married, having a baby, birthday or going for a vacation, you can email a timer that count downs the days till your event, so your loved ones can easily follow the countdown with you.

How to Find Whale Fossils

Finding a whale fossil can be done in two separate ways. You can discover a whale fossil, which will require you digging up or uncovering a whale bone in an area that was once sea but is now land. You will need to do this before anybody else has had the chance to cover this area. The second way is t

Classification of Living Things Craft Projects

To study the natural world, scientists classify things, starting with living and non-living things. Living things can be further classified into smaller and smaller groups to allow for easier study. The main classification of living things is in a specific kingdom, phylum, class, order, family, genu

How to Use Solar Energy in Pennsylvania

Solar energy could drastically decrease your home energy bills. There are small solar energy kits that can power high-current devices like refrigerators, stoves, hotplates and irons. These devices can be responsible for larger power bills and create a larger carbon footprint. Solar energy is limitle

How to Make a Barometric Pressure Instrument

No matter where you get your local weather forecast, the weather conditions will include the barometric pressure, or atmospheric pressure. Barometers, the devices that measure this pressure, can use mercury, water or trapped air to detect pressure changes. In general, high pressure indicates fair we

Aims and Objectives of Studying Biology

The study of biology can have a multitude of aims and objectives. Largely, it is studied to allow a person to enter a specific field of employment. Other aims for studying biology are intellectual, ethical and pragmatic: to increase knowledge about all aspects of organisms, to encourage greater bene

The Mechanical Properties of Stainless Steel

Stainless steel is used in construction.a stainless steel image by Yuriy Rozanov from Fotolia.comSteel is the general name given to a large range of iron alloys. There are three major types of steel: carbon steels, alloy steels, and stainless steels. Stainless steel is classified as steel...

How to Switch From Fuel to Electric Motors in RC Airplanes

Fuel model RC airplanes have the benefits of speed and long lasting flight, with a quick refill option that can keep you flying for hours at a time. They're also difficult to control, noisy, and expensive to operate, with many localities limiting where you can fly them. Because of these disadvantage

Steps of Distillation

Scientists use distillation on both a small scale in laboratories and a large scale in industrial processes, such as oil refineries. Distillation is a very efficient way to separate a liquid from either another liquid or a solid. In distillation, a mixture is heated until the most volatile component

Information for Kids About Electromagnets

Magnets attract, or pull, some kinds of metal objects. Stronger magnets exert a greater pull on the objects they attract. Sometimes it would be useful if you could "turn off" a magnet when you did not want it to attract objects. That is what an electromagnet can do. Some electromagnets --- like thos

Reduction of Benzophenone by Sodium Borohydride

Benzophenone reacts with sodium borohydride in a methanol solution. The result is diphenylmethanol and a secondary reactant. The reduction starts with breaking the benzophenone carbon-oxygen double bond. The carbon attracts a hydrogen atom from borohydride, and the oxygen attracts a hydrogen atom f

What Causes the Length of Daylight Through the Year?

In the Northern Hemisphere daylight hours are longer during the summer and shorter during the winter. The actual position of the Sun on the horizon also changes. This brings with it the characteristic changes in weather experienced during the seasons. There are two main causes of this, the position

How to Convert a Guitar Amp to 240V

A guitar amplifier is used to magnify the output signal coming from the electronics of an electric guitar. An amplifier produces a magnified copy of the input signal by means of a powered active component such as a vacuum tube or transistor. Most guitar amplifiers use an electrical signal that has b

What Are the Planets in Our Solar System Held in Their Fixed Revolutions?

Our solar system is located in the Orion arm of the Milky Way galaxy. It has eight planets, each of which orbit the sun at the center of the solar system. Pluto was once thought of as the ninth planet. However, discoveries lead to a change in the definition of a planet, and, according to NASA, Pluto