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Why does the drinking straw does not drip out when you press the top of the straw with your thumb or finger tip?
Your finger prevents air from entering through the top of the straw. As fluid moves down the straw it leaves a void in it's wake, one that is usually immediately filled by air. By preventing the air from entering the top of the straw, the fluid cannot move downwards because to do so would leave a vacuum space between your finger and the fluid; this "sucks" the fluid back in into place and prevents it from decending down the straw.
How does a straw oboe make sound waves?
...By vibrating the straw. It works roughly like a kazoo. The vibrations move the air, which is all a sound wave is.
Why does a soft drink rises when sucked with a straw?
As you suck on the straw air is removed from the inside of the straw and the air pressure within the straw is reduced. Once the straw's air pressure is reduced past atmospheric pressure of about 760 mmHg, the Patm forces the drink up the straw and into the sucker's mouth. Gases move from high to low pressure areas until equilibrium is reached.
Why does the liquid move up the straw?
Because when you suck it you are forcing the liquid in only one direction. up
How do straws work?
Drinking liquid through a straw uses the invisible pressure of the atmosphere to move a column of liquid. The air all around us is under pressure, from the rest of the atmosphere above it pushing down. (This is about 15 pounds per square inch at sea level.) You are reducing the pressure at the top of the straw*. The air pushing down on the surface of the liquid will force the liquid up the straw. So you are technically not "pulling" the liquid, it is being "pushed" by the air.*When you suck on a straw, the diaphragm under your lungs drops down, reducing the pressure in your lungs. This reduces the pressure in your mouth and likewise at the top of the straw.Air Pressure ExperimentYou can show that the air has pressure by inhaling at the top of an empty plastic bottle (a two-liter soft drink bottle is perfect for this). The sides of the bottle will cave in as you remove air from the bottle.(see related question)
How to make a working model on automatic weather recording devices?
To make a device for recording weather, like a barometer, you need a balloon, scissors, tape, jar, straw, and rubber band. Stretch the balloon and cut off the top; the top half of the balloon should be secured to the jar with the rubber band. Tape the straw to the top of the jar and balloon so it is hanging off horizontally and mark the position of the straw on a piece of paper. The straw will move up and down depending on the weather and this information can be recorded.
Why does the drinking straw does not drip out when you press the top of the straw with your thumb or finger tip?
Your finger prevents air from entering through the top of the straw. As fluid moves down the straw it leaves a void in it's wake, one that is usually immediately filled by air. By preventing the air from entering the top of the straw, the fluid cannot move downwards because to do so would leave a vacuum space between your finger and the fluid; this "sucks" the fluid back in into place and prevents it from decending down the straw.
How does an aneroid barometer measure atmospheric pressure?
A barometer is an instrument used to measure atmospheric pressure. It can measure the pressure exerted by the atmosphere by using water, air, or mercury.An aneroid barometer is a barometer which measures pressure without using fluids!An aneroid barometer is somewhat different and uses a sealed chamber upon which the fluctuating atmospheric pressure acts. Through mechanical means a pointer is moved on a calibrated scale.
What led to the development of the aneroid barometer?
Evangelise Torricelli invented the mercury barometer in the 1600s. It was very accurate, but it was clumsy to move and had to stay upright. If humans hadn't invented the aneroid barometer, you would see big mercury barometers in all types of transportation.
How is drinking from a straw the same as an egg going into a glass bottle?
Drinking from a straw is the same as an egg going into a glass bottle, because air pressure in both cases is used to move something. In the straw, you reduce the air pressure in the straw, so the air pressure around the drink pushes it up into the straw and into your mouth. In the egg, you reduce the air pressure in the bottle, and air pressure around the egg pushes it down into the bottle.
Can track storms at different altitudes?
They use radar to watch the storm move and a barometer to study its pressure!
What can track storms at different altitudes?
They use radar to watch the storm move and a barometer to study its pressure!
How does a straw oboe make sound waves?
...By vibrating the straw. It works roughly like a kazoo. The vibrations move the air, which is all a sound wave is.
Why does a soft drink rises when sucked with a straw?
As you suck on the straw air is removed from the inside of the straw and the air pressure within the straw is reduced. Once the straw's air pressure is reduced past atmospheric pressure of about 760 mmHg, the Patm forces the drink up the straw and into the sucker's mouth. Gases move from high to low pressure areas until equilibrium is reached.
What is the difference between how air pressure is indicated in a mercury barometer and an aneroid barometer?
Usually no difference at all. They can both move a pointer around a circular scale. The scale can be calibrated in both Inches of Mercury (InHg) or Millbars (Mb). An aneroid system can lend itself more easily to a digital display.
How does homemade lava lamps works?
it has this wax called hydromonic substance that make the lava move
How does a homemade lava lamp work?
it has this wax called hydromonic substance that make the lava move
