You can see sound waves when a microphone is connected to an oscilloscope. A microphone changes the sound waves into an electrical signal. The oscilloscope then shows what these electrical waves look like.

Sound waves are not always invisible. Sound is simply the ordered vibration of matter (as opposed to heat, which is the disordered vibration of matter). Any time you see a vibration, you are seeing sound. This is not because sound is invisible, but is because air is invisible.

Sound is a vibration, or wave, that travels through the air. Sound waves are invisible to our eyes; unless we find a way to make the sound waves move something that we can see. In this activity, your child will use different noise-making objects to cause sound waves and make sand visibly move.

In science, sound is defined as the transfer of energy from a vibrating object in waves that travel through matter. The vibrations generate longitudinal waves that travel through matter in all directions. Most sounds we hear travel through air, but sounds can also travel through liquids and solids.

Light and sound are not regarded as forms of matter. In contrast, matter is made up of particles that do have mass. Sound is a little different in that it is the propagation of a pressure wave through a medium of particles. Since it is a wave, it is not considered a form of matter.

It is important to remember that all waves transfer energy but they do not transfer matter .

Examples of Matter

• An apple.
• A person.
• A table.
• Air.
• Water.
• A computer.
• Paper.
• Iron.

Matter is usually defined as something that has mass and takes up space. So a shadow is not matter, since it has no mass and takes up no space. Instead, a shadow is a lack of light on a certain area.

On earth, solid, liquid, and gas are the most common states of matter. Not only is water the most common substance on earth, but it is also the only substance that commonly appears as a solid, a liquid, and a gas within the normal range of earth’s temperatures.

Water can occur in three states: solid (ice), liquid, or gas (vapor).

Is it possible to make water? Theoretically, it is possible. You would need to combine two moles of hydrogen gas and one mole of oxygen gas to turn them into water. However, you need activation energy to join them together and start the reaction.

The answer: very. Just mixing hydrogen and oxygen together doesn’t make water – to join them together you need energy.

Though water itself doesn’t expire, bottled water often has an expiration date. This is because plastic can begin to leach into the water over time, contaminating it with chemicals, such as antimony and bisphenol A (BPA) ( 5 , 6 , 7 ).

A scientists takes a sample of water from a mine deep underground in Ontario, Canada. The water turned out to be 2.6 billion years old, the oldest known water on Earth.

Not all water in the Solar System today could have formed here, researchers say. As much as half of the water in Earth’s oceans could be older than the Sun, a study has found. The dense interstellar clouds of gas and dust where stars form contain abundant water, in the form of ice. …

Hauling tons of water to the space station is inefficient and costly. In 2009, NASA astronauts began recycling urine using the Urine Processor Assembly, which is able to reclaim 75 percent of water from urine.

In some parts of the world, the wastewater that flows down the drain – yes, including toilet flushes – is now being filtered and treated until it’s as pure as spring water, if not more so. It might not sound appealing, but recycled water is safe and tastes like any other drinking water, bottled or tap.

When urine is collected at home, the majority of the nutrients present in wastewater can be kept away from wastewater treatment plants. To take advantage of the nutrients passed in urine, it can be recycled as fertiliser for agriculture.

Astronauts themselves are important sources of water in outer space. With the help of a special centrifuge, their urine is distilled, then processed to provide clean drinking water.

Astronauts on deep-space missions could recycle their own feces to make food. Researchers built this cylindrical piece of equipment to help transform poo into edible microbes. It’s a long way to Mars, and astronauts will need to eat. including poop.

The fact is this is simply… false. Not only will your urine not rehydrate you, it will have the opposite effect and dehydrate you at a faster rate. In fact, these dire moments are perhaps the most dangerous time to imbibe your own brew.

Luckily for science, someone figured out a method. Unluckily for the astronauts, it’s turning their own pee into potable drinking water. So the urine will be sprayed out along the back wall as it spins,” she said.