toefl reading comprehension practice online


How to Read What Ton AC Unit I Have

Within an air conditioner a specific substance known as a refrigerant is changed between gaseous and liquid states by applying pressure changes within a sealed system. This process is called refrigeration. Refrigeration capacity is measured by how much heat can be moved within a given period of time. One unit of measure for this capacity […]



How to Read an Indicator Color Chart

Indicator color charts come in different varieties and are used to show the pH of a substance. Chemical compounds that change color in response to acid or base materials are usually embedded in a piece of paper or other substrate. The substance being tested is then applied, turning the compound a new color. The simplest […]



How to Test a Car Battery With a Multimeter

Few things can ruin an adventurous road trip as quickly as a dead battery in a small town in the middle of nowhere — and with no mechanic. A car’s battery is essential to giving the starter motor the energy required to turn the flywheel until the engine reaches self-sustaining combustion. A few minutes of […]



Can You Read Your iPad App Magazines on Your Computer?

With the size of the screen and the user-friendly interface, many people rely on the iPad for their magazine reading needs instead of opting for the print version. If you purchase magazines on your iPad regularly, you may also wish to read them on your computer monitor. Depending on the method you use to get […]



How to Read a Lensometer

A lensometer is an optometric device used to determine, or read, the prescription in an optical lens. The lensometer reads spherical power, cylindrical power, axis, and pupillary distance, and can also determine prism in a lens. The measurement images inside the lensometer are called mires, and are adjusted to determine prescription. The Eyepiece Adjust the […]



How to Use a DVD Player to Read Computer Files

Since DVD-writing programs create ISO files, or disc image files, from the media files that are loaded into the program before burning the files to disc, the disc created in the programs can be played in most DVD players that accept DVD-Rs. To use a DVD player to read data files that are stored on […]



How to Read a Digital Multimeter Ohm Scale

A digital multimeter can be used to measure voltage, amperage and resistance. Resistance values are measured in ohms, thousands-of-ohms, and millions-of-ohms. The reading on a multimeter display will depend upon which measurement type is selected on the multimeter’s selection dial. Using a few simple steps will give you an understandable reading on the meter’s digital […]



How to Read Email on Kindle

The Kindle is an electronic e-reader created and sold by Amazon.com. Most people know they can use their Kindles to download and read books and to browse content on some of their favorite Web pages, but many people might not realize they can use their Kindles to read and send email as well. Turn on […]



How to Understand Dialysis Readings on the Machine

People who suffer from end stage renal disease must receive dialysis on a routine basis to replace the function of their nonworking kidneys. A dialysis machine is a delivery system for the fluids and artificial kidney that helps to cleanse the patient’s blood and remove excess fluid from their body. These machines are intended for […]



Eye Tests for Reading Glasses

Optometrists and ophthalmologists check your near vision with several basic eye tests. The exam for reading glasses only takes about a half hour to an hour. If you need a near correction, when the testing is complete you will have a written prescription for eyeglasses that will help you better see small print and fine […]



How to Read an Eye Chart Without Glasses

One of the routine tests for an eye exam is to have your visual acuity checked using eye charts. This is often done using a Snellen eye chart for distance and a Jaeger reading chart or card for near visual acuity. If you wear glasses, these tests are often performed while they are on, however, […]