# Physical Science

Physical science is the study of the physical world around you. Learn about everything from electricity to magnetism in this section.

### Brown Noise vs. White Noise: Which Is Best for Quality Sleep?

### Can a sound wave kill you?

### Can two cans and a string really be used to talk over a distance?

### Understanding the Empirical Formula in Chemistry

### The Most Expensive Metal in the World Isn't Gold or Platinum

### Delta-8 vs. Delta-9: Comparing Types of THC

### How Electricity Works

### How Faraday Cages Work

### How Gasoline Works

### What do bugs have to do with forensic science?

### 5 Things You Didn't Know About Autopsies

### Do a Person's Fingerprints Change After Death?

### How Alchemy Paved the Way for Chemistry

### How did Nikola Tesla change the way we use energy?

### Time May Not Exist, Say Some Physicists and Philosophers

### Why Does Ice Stick to Your Fingers?

### What if I forgot to remove a piercing before an MRI?

### A Kid-friendly Introduction to Magnets and Magnetism

### Adjacent Angles: Types and Examples

### What Is the Associative Property of Mathematics?

### What Is a Linear Pair of Angles in Geometry?

### 5 Hugely Fun Facts About Mass (Not Weight)

### Antarctica's Spooky Cosmic Rays Might Shatter Physics As We Know It

### Entropy: The Invisible Force That Brings Disorder to the Universe

### The Demon Core: A Tale of Atomic Ambition and Tragic Fate

### Half-Life Formula: Components and Applications

### Could an 'X17 Particle' Hint at a Fifth Force in the Universe?

### Why Are School Buses Yellow?

### HowStuffWorks: How To Draw An Impossible Shape

### What Are the Colors in the Visible Spectrum?

### Learn More

Adjacent angles are one of the earliest and most important concepts to learn in basic geometry, as they have applications in further subjects like trigonometry, physics, and engineering. Effective students of geometry should be able to identify adjacent angles on sight and calculate them to a great degree of accuracy without a protractor.

By Talon Homer

When pursuing an education in mathematics and algebra, one of the earliest and most important concepts to understand is the associative property, also known as the associative law.

By Talon Homer

In chemistry, there are a variety of methods that scientists use to identify a chemical compound, including a molecular formula, molar mass and molecular diagram. The simplest formula of these is known as the empirical formula.

By Talon Homer

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In the subjects of geometry and trigonometry, a linear pair of angles is any two adjacent angles formed together to add up to 180Â°, or Ï€ (pi) radians.

By Talon Homer

Precious metals are not just shiny and attractive; these elements are also incredibly valuable, often used in a wide range of industries from jewelry to high-tech applications.

By Mack Hayden

With its three sides and three angles, the triangle is one of the most basic shapes in geometry. This means calculating the area of a triangle is a fundamental skill in geometry, with multiple formulas available depending on the type of triangle and the given data.

By Marie Look

In your study of math, you will likely come across the concept of factors at a certain point. While this can be daunting if you've never encountered it before, it won't take long before you're able to determine all the factors of a particular number.

By Zach Taras

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Integers are natural numbers (or whole numbers) that stem from the Latin word meaning "intact." In other words, any two integers will be rational numbers. A rational number is a value without fractional part or decimal remainders.

By Mitch Ryan

A rectangular prism is a three-dimensional cuboid figure. In the same way that a triangular prism brings three connected lines to life in the real world, a rectangular prism takes the length and width of two-dimensional rectangles to the next level by adding height into the equation.

By Mitch Ryan

Anyone who's ever faced mind-numbing trigonometry problems and practice questions will be familiar with the Pythagorean Theorem and its square root principles in the 30-60-90 triangle. This special triangle has several short-cut rules to help new mathematicians find interior angles and linear lengths quickly.

By Mitch Ryan

In algebra and calculus, a polynomial function is used to chart out graphs and waves with much more complexity than a simple linear factor. Polynomial division is sometimes required to factor them, and cut them up into chunks that we humans can better understand.

By Talon Homer

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Arcs are an important aspect of geometry, physics, trigonometry and design work. However, curved lines are much more difficult to measure than straight lines, which is why it's important to familiarize yourself with the arc length formula.

By Talon Homer

The interquartile range (IQR) is a statistical measure of the middle values of a sample data set that is separated into four equal parts. This middle-value grouping can provide a median range between the upper half and lower half of the data you've collected, allowing you to ignore extreme values.

By Mitch Ryan

The mnemonic device SOHCAHTOA helps budding mathematicians remember the trigonometric functions sine (sin), cosine (cos) and tangent (tan), which they need to solve for triangles' missing sides and angles.

By Marie Look

When you're dealing with exponents, numbers can get very big (or very small) very quickly. Therefore, it's helpful to have some short cuts.

By Zach Taras

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Absolute value is a mathematical concept often used in conjunction with a number line or graph to represent the relative value from zero (modulus). To illustrate this idea in a different way, the absolute value of a number can be closely related to distance in the physical world.

By Mitch Ryan

A coordinate plane is a mathematical, two-dimensional plane formed by two number lines. A horizontal number line and a vertical number line intersect to form two axes (plural for axis), and a grid system comprised of four quadrants.

By Mitch Ryan

The concept of place values is fundamental to mathematics and the number system, particularly when you're dealing with whole numbers and decimal numbers. A place value chart is an essential tool that can help students visualize the position of each digit in a number and understand its actual value within the context of the number.

By Marie Look

You've probably seen supplementary angles examples in your everyday life without knowing it. Whether you pass a leaning sign on a flat highway or walk by a shed with a lean-to roof â€” whenever two angles combine to form a straight, linear pair, there they are.

By Mitch Ryan

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Mathematicians use something called interval notation to convey information about a range of values in a way that's clear and easy to understand. This form of writing is necessary because intervals are common concepts in calculus, algebra and statistics.

By Marie Look

Fundamental trigonometric identities, aka trig identities or trigo identities, are equations involving trigonometric functions that hold true for any value you substitute into their variables.

By Marie Look

Algebra is the branch of mathematics that focuses on formulas, and one of its key concepts is the representation of linear equations, which describe straight lines.

By Marie Look

Whether you're studying up for a math test, helping your child with homework or just trying to brush up before trivia night, learning the basic ins and outs of polygons will serve you well.

By Mitch Ryan

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A rhombus is a parallelogram shape with two pairs of parallel sides and four equal sides. These four sides of equal length also define the rhombus as an equilateral quadrilateral. Etymologically, the name of this shape stems from the Greek word "rhombos," which roughly translates to "spinning top."

By Mitch Ryan

Greater than, less than, equal to: These terms are mathematical expressions that allow the user to compare two numbers or equations. Once you've become familiar with these terms â€” and the symbols used to represent them â€” you'll be able to apply them to various math problems.

By Zach Taras