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Metric Measuring Tools
Some measuring tools measure in both metric and Imperial units.steel ruler image by dwags from Fotolia.comThe metric system of measurement was invented in France and used throughout Europe. Its basic units of measurement are for distance, weight, volume, temperature, time and electric...
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
The Differences Between the Metal Alloys of Sterling Silver and Carbon Steel
An alloy is a mixture of two or more metals, with one required to be a metal so that the alloy will maintain its metallic properties. Alloys are produced with either atoms of similar size or with atoms of differing sizes. Sterling silver and carbon steel are two alloys that, while similar in many re
How to Calculate Uncertainty in Velocity If You Are Given the Percentage of Uncertainty
How fast are you driving? A glance at the speedometer gives you the speed, but science tells us that this reading is not necessarily the actual speed at which you are traveling. All measurements taken from the world in which you live hold some uncertainty based on human and machine error. The uncert
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 Glue Boxes
Handcrafted boxes can be created to hold personal treasures, a meaningful gift for a loved one, or to place a Christmas gift in during the holidays. You can purchase handcrafted boxes at a craft supply store, or you can make them yourself using crafting materials, such as press board and hot glue. O
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
The Effects of Refrigerants
Refrigerants have detrimental effects on the Earth's atmosphere.window air conditioner image by Aaron Kohr from Fotolia.comThe Montreal Protocol of 1987 established international requirements for the phasing out of ozone-damaging chlorofluorocarbons, or CFCs. According to the...
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
How to Determine the Authenticity of a Knife
To be sure the knife you purchase is authentic requires that you know materials, patterns and craftsmanship. When attempting to sell a knife that is not genuine, counterfeiters rely on trust, a lack of knowledge and your desire to find a bargain. Follow these suggestions to help avoid disappointing
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 Much Are Old Timer Knives Worth?
Old Timer Knives were a line of knives produced by the Imperial Schrade Corporation. Beginning as Schrade Cutlery in 1904, the Old Timers consisted of traditional jackknives, fixed-bladed knives, folding knives and other pieces that captured the spirit of the nation's pioneering backwoodsmen. The co
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