Education & Communication

Last modified: 2025-01-24 13:01

Solubility is a concept used in chemistry to express the ability of a solid compound to dissolve completely in a liquid without leaving undissolved particles. Only ionic compounds are soluble. To solve practical questions, it is sufficient to memorize some rules or refer to a table of soluble compounds, to know if most of the ionic compound remains solid or if a considerable amount dissolves once immersed in water.

Last modified: 2025-01-24 13:01

How is salt obtained from salt water? For centuries, this question has engaged sailors and science students. The answer is simple - evaporation. When you let the salt water evaporate (through natural or artificial heat), only the water evaporates - the salt remains.

Last modified: 2025-01-24 13:01

Net ionic equations are a very important aspect of chemistry, as they only represent entities that are changed within a chemical reaction. Normally, this type of equation is used for the chemical redox reactions (in jargon simply called 'redox reactions'), double exchange and acid-base neutralization The main steps to obtain a net ionic equation are three:

Last modified: 2025-01-24 13:01

Molar absorbivity, also known as the molar extinction coefficient, measures the ability of a chemical species to absorb a given wavelength of light. This information allows you to perform a comparative analysis between different chemical compounds without having to take into account the differences in concentration or size of the solution during the measurements.

Last modified: 2025-01-24 13:01

Dilution is the process by which a concentrated solution is made less concentrated. There are many reasons for wanting to dilute, from the most serious to the most random. For example, biochemists dilute solutions from their concentrated form to create new solutions for use in their own experiments, while, completely on the other hand, bartenders often dilute liquors with light drinks or juice to create quieter cocktails.

Last modified: 2025-01-24 13:01

It is always advisable to purchase the most diluted acid possible suitable for your specific needs, both for safety reasons and to facilitate its use. However, it is sometimes necessary to further dilute. Do not neglect protective equipment, as concentrated acids can cause severe chemical burns.

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Every time you combine chemicals, whether in the kitchen or in the laboratory, you create new ones that are called "products". During these chemical reactions, the heat can be absorbed and released from the surrounding environment.

Last modified: 2025-01-24 13:01

To calculate the power (watts) absorbed by an electronic device just solve a simple equation. The only information necessary for the calculation is the number of amperes (A) and the number of volts required for the operation of the device in question.

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To separate the salt from the sand or sugar you will have to try your hand at chemistry. Both salt and sugar dissolve in water, so you won't be able to use it to separate them. However, you can do this using an alcohol solution. Steps Part 1 of 3:

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Water can be distilled through very simple and reproducible processes even in your home. When you are able to eliminate the solid components, minerals and chemical compounds present from the water, you will have obtained distilled water. You can use it for various purposes, for example to drink it, to water the plants, to operate your humidifier, the iron or your aquarium.

Last modified: 2025-01-24 13:01

In physics, tension is the force exerted by a rope, wire, cable, and the like on one or more objects. Anything that is pulled, hung, supported or swung is subject to the force of tension. Like any other force, tension can cause an object to accelerate or deform it.

Last modified: 2025-01-24 13:01

A pendulum consists of a mass suspended on a wire or cable that rocks back and forth. Pendulums are found in ancient clocks, metronomes, seismometers, and certain incense burners, and can be used to explain complex physics problems. Steps Method 1 of 3:

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While there is no direct way to convert watts (W) to amperes (A), it is possible to calculate the intensity of the current flowing in an electrical circuit using the physical relationships that tie electrical current, power, and voltage. These bonds vary according to the type of power supply used:

Last modified: 2025-01-24 13:01

A storm is approaching, and suddenly there is thunder, it seems very close, even scary! But how "close" is lightning really? Calculating the distance to the lightning bolt can make you feel at ease if you are in a safe place or, conversely, it can convince you to find it as soon as possible.

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Force is a vector physical quantity that describes the interaction that occurs with an object to set it in motion or give it an acceleration. Newton's second law describes how force relates to the mass and acceleration of a body and is used to calculate its value.

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A capacitor is an elementary electronic component that stores electrical charge similar to a battery. Capacitors are versatile, and are used in very important electronic circuits such as radio tuners and signal generators. A capacitor is very simple:

Last modified: 2025-01-24 13:01

When connecting electrical devices to a power source, you can proceed with a parallel or series connection. In the first case, the electric current flows through different paths and each device has its own independent circuit. This arrangement offers the advantage of not interrupting the flow of energy when an element does not work, as it does for the one in series.

Last modified: 2025-01-24 13:01

The force of gravity is one of the fundamental forces of physics. Its most important aspect is that it is universally valid: all objects have a gravitational force that attracts others. The force of gravity exerted on an object depends on the mass of the bodies examined and the distance that separates them.

Last modified: 2025-01-24 13:01

The buoyancy is a force that acts in the opposite direction to gravity on all objects immersed in a fluid. The weight pushes the object onto the fluid (liquid or gas) while the buoyancy brings it up, counteracting gravity. In general terms, the hydrostatic force can be calculated by the formula F.

Last modified: 2025-01-24 13:01

One of the favorite devices of science fiction writers and action movie writers is the electromagnetic pulse generator (EMP). An EMP is able to disable all electronic tools that are within its scope; be careful, though, as it could prove dangerous, and monitor children closely in case they want to try their hand at this project.

Last modified: 2025-01-24 13:01

Normal force is the amount of force needed to counteract the action of external forces present in a given scenario. To calculate the normal force one must consider the circumstances of the object and the data available for the variables. Read on for more information.

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The bulb is made up of a filament that heats up until it becomes incandescent; the best known models are the incandescent bulbs which are widely used in homes. This article shows you how to build one. Steps Method 1 of 2: Making a Simple Graphite Light Bulb Step 1.

Last modified: 2025-01-24 13:01

The resulting force is the sum of all the forces acting on an object taking into account their intensity, direction and direction (vector sum). An object with a resultant force of zero is stationary. When there is no balance between the forces, ie the resulting one is greater or less than zero, the object is subjected to acceleration.

Last modified: 2025-01-24 13:01

Wind turbines generate energy, just like old windmills. Instead of using it to grind grain, however, modern turbines harness the wind to generate and store electricity, helping to meet the demand for renewable energy. Industrial turbines are too big for households, but you can learn how to build a smaller version to meet your energy needs.

Last modified: 2025-01-24 13:01

The electromagnet is a classic scientific experiment, often carried out in the school environment. The idea is to turn an iron nail into a magnet using a copper coil and a battery. The principle of operation of an electromagnet is based on the transfer of electrons, subatomic particles that carry a negative charge, from the battery into the coil.

Last modified: 2025-01-24 13:01

Frequency, also called wave frequency, is a quantity that measures the total number of repeated waves or oscillations in a given time interval. There are several ways to calculate the frequency, depending on the information and data available to you.

Last modified: 2025-01-24 13:01

You may have already heard that "opposites attract"; While it is not always the best advice for a relationship, it does represent the fundamental rule for the polarity of magnets. Since humans live on a huge magnet (planet Earth), by understanding how low-scale polarity works you can understand the mechanisms of the Earth's magnetic field that protects us from space radiation.

Last modified: 2025-01-24 13:01

Magnets are found in motors, dynamos, refrigerators, credit cards, debit cards, and electronic instruments such as electric guitar pickups, stereo speakers, and computer hard drives. They can be permanent magnets made of naturally magnetized metal or iron alloys or electromagnets.

Last modified: 2025-01-24 13:01

In classical physics, mass identifies the amount of matter present in a given object. By matter we mean everything that can be physically touched, that is, that has a physical consistency, weight and is subject to forces present in nature. Mass is generally related to the size of an object, but this relationship is not always true.

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Calculating the mass of an object is a necessary operation in many scientific experiments and mathematical problems. Without the help of a guide this calculation may seem impossible, but with the simple steps outlined below it will be as easy as memorizing pi.

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Atoms can lose or gain energy as an electron moves from an outermost to an innermost orbital around the nucleus. However, dividing the nucleus of an atom releases a much greater amount of energy than that generated by the movement of the electron on a lower orbital.

Last modified: 2025-01-24 13:01

An electromagnetic pulse (EMP) is a natural phenomenon caused by a rapid and sudden acceleration of particles (usually electrons), which in turn creates a discharge of electromagnetic energy. The most common causes of EMPs that occur on a daily basis are:

Last modified: 2025-01-24 13:01

Physics is the science that studies all the "physical" aspects of the universe (mechanical, electrical, energetic and so on). It is a difficult subject to learn, but by studying with constancy and concentration you can be able to master it.

Last modified: 2025-01-24 13:01

This article explains the process of "calculating" the barometric pressure for weather analyzes or forecasts. Conversions are of practical use. Perhaps it should be explained from the outset that you will not "calculate" the barometric pressure:

Last modified: 2025-01-24 13:01

Magnetic attraction is one of the most relevant phenomena in science and is considered by science teachers as a real "discrepant event", that is, a situation in which matter does not behave as children, from experience, expect. The phenomenon occurs when negative and positive particles in an object align specifically, generating an attraction or repulsion with neighboring particles.

Last modified: 2025-01-24 13:01

The resistive circuits can be analyzed by reducing a network of resistors in series and parallel to an equivalent resistance, for which the current and voltage values can be obtained by means of Ohm's law; known these values, you can proceed backwards and calculate the currents and voltages at the ends of each resistance of the network.

Last modified: 2025-01-24 13:01

Have you ever worked on a project in a very limited space, or with really tiny screws? Did they fall while you screwed them in and you had to look for them, or did you really lose them, one after the other? Here is the answer to your problem:

Last modified: 2025-01-24 13:01

In order to calculate the electrical voltage present across a resistor, you must first identify the type of circuit to be studied. If you need to acquire the basic concepts related to electrical circuits, or if you simply want to refresh your school notions, start reading the article from the first section.

Last modified: 2025-01-24 13:01

Static electricity is the product of an imbalance between positive and negative charges on the surface of an object. It can be visible, for example when you notice a spark after touching a metal door handle; however, a more complex procedure is required to physically measure it.

Last modified: 2025-01-24 13:01

Horsepower is a unit of measurement of power. The term was originally coined by a Scottish engineer to compare the power of the steam engine to that of horsepower. This article tells you how to calculate the horsepower of a vehicle's engine, an electric motor, and even your body.