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A block and tackle is derived from the pulley. Pulleys are grooved wheels designed to be fitted with a cable or rope, and to turn freely within a block. The rotational effect of the wheel allows the user to change…
Insects make up the majority of earth’s biomass, with some estimates as high as 1 million named species and 100 million more yet to be discovered. Many of these insects spend at least part of their lives underground. Bumble bees,…
Thermometers have myriad uses in science, engineering, industry, medical facilities and daily living. Thermometers come in several types, but the liquid-in-glass mercury thermometer is one of the most well-known. The operation of the mercury thermometer is simple to understand once…
The total number of white blood cells (WBC) in a blood smear is called a WBC count. When you conduct a WBC count, you actually receive a total that includes both WBCs and nucleated red blood cells. Nucleated red blood…
There are almost 3,000 species of snakes, and only 375 of those are venomous. Although snakes are found on every continent except Antarctica and in almost every country, they are most common in tropical regions. Snakes typically hunt small animals,…
A reptile is a vertebrate that is covered in scales and breathes air through lungs. Reptiles can be divided into three major groups: crocodiles, lepidosaurs (snakes and lizards), and turtles. Of the three, live birth is only seen in lepidosaurs.…
The grass in a rectangular yard needs to be fertilized, and there is a circular swimming pool at one end of the yard. The amount of fertilizer you need to purchase is based on the area needing to be fertilized.…
A forest ecosystem describes the community of plants, animals, microbes and all other organisms in interaction with the chemical and physical features of their environment: Specifically, a terrestrial environment dominated by trees growing in a closed canopy — a forest,…
Muriatic acid is a common name for hydrochloric acid, a highly corrosive chemical substance. This compound has numerous industrial and domestic uses, ranging from food, metals and polymer processing to swimming pool water disinfection. Even in dilute form, muriatic acid…
Barometric pressure, an indicator of the weight of column of air, ranges from an historic high of 32.01 inches to an all-time low of 25.9 inches. Electronic barometers now are available in addition to older-style units that use a needle…
