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How did the drinking bird from the 1960s work to continue to bob its head into a glass of water?
The classic bobbing or drinking bird toy has amused kids and adults for years. It appears to be perpetual motion (impossible) but is actually a heat engine with a lot of thermodynamics going on. Although the bird is often thought to be a recent invention it was invented in 1945 and patented in 1946. The "toy" was the brainchild of to PHD candidates, Miles V. Sullivan and George H. Shackley. The science is so complex that it has been the basis of several thermodynamics courses.
The classic bird is made from two glass bulbs joined by a glass tube. The tube extends almost to the bottom of the bottom bulb. It is joined to the top bulb but only at the end. The bulb contains some fluid which evaporates and condenses easily at about room temperature. The bird so far is similar in construction to the "love meters" which move fluids from one bulb to the other based on the heat of your hand.
The other parts of the bird are a bird beak or head made of absorbent material, a pivot which lets the bird balance on a stand, and a glass of water for the bird to dip its beak into. The actual operation of the bird is the result of several gas laws, evaporative cooling and, pressure changed due to heat, leverage and showmanship!
What happens is:
- The birds felt (or similar) head is dampened with water and positioned in front of a glass of water located so that the beak will swing down into the water if it moves forward about the pivot.
- The water on the felt evaporates cooling the head, creating a vacuum in the gases (through condensation of the gas there) and subsequently sucking up fluid from the bottom bulb
- This makes the head heavier and it swings down dipping the nose into the water.
- The water absorbs into the beak fabric, warming the fabric and the bulb, which in turn warms the gases in the head.
- The warmed gases expand increasing the top bulb pressure and expelling the fluid back into the bottom bulb
- The head (now lighter as the fluid is gone) raises, the water starts to evaporate cooling the head and restarting the cycle
What else can I help you with?
What is the amount of liquid a drinking glass hold?
One drinking glass holds about 230 ml ( milliliters )
The depth to which an inverted drinking glass must be pushed beneath the surface of water so that the volume of enclosed air is squeezed to half is?
The inverted drinking glass must be pushed to a depth where the water level inside the glass is halfway between the original water level and the top of the glass. This ensures that the volume of enclosed air is squeezed to half.
What is on the side of your drinking glass on a hot day?
Condensation may form on the side of a drinking glass on a hot day. This occurs when the cold surface of the glass comes into contact with the warmer air, causing the water vapor in the air to cool and collect on the surface of the glass.
Which water should be cold and cold when doing a old remedy for a pair of nested drinking glasses?
Put cold water inside the glasses. Dip the outer glass into hot water. The outer glass expands, the inner glass contracts.
Why do drinking glasses slide across the counter when they are wet?
When a drinking glass is wet, the layer of water underneath creates less friction between the glass and the counter, making it easier for the glass to slide. This reduced friction allows the glass to move more freely across the surface, especially if there are no grips or stops to prevent it from sliding.
What glass goblets are for?
Drinking wine and water
How long does it take for a glass of water to reach your bladder after drinking it?
After drinking a glass of water, it typically takes about 30 minutes to 2 hours for the water to reach your bladder.
How long does it typically take for someone to urinate after drinking a glass of water?
It typically takes about 30 minutes for someone to urinate after drinking a glass of water.
Why should you not pour very hot water into a drinking glass?
because the glass will pop if you put the very hot water into the glass
Can you have a glass of water?
Depending on the accessibility of both clean drinking water and a glass to pour it in, you might or might not be able to have it.
Does water burn calories while your drinking it?
Drinking water does burn calories and drinking an 8-ounce glass of cold water burns 9.25 calories more than drinking room temperature water.
What are the health benefits of drinking water from a green glass bottle?
There is no scientific evidence to suggest that drinking water from a green glass bottle provides any specific health benefits compared to drinking water from other containers. It is important to stay hydrated by drinking an adequate amount of water regardless of the container it is stored in.
What is the shape of water in a drinking glass?
The shape of water in a drinking glass typically conforms to the shape of the glass itself, taking on a cylindrical or conical shape. It fills the container from the bottom up, forming a level surface at the top due to gravity.
Which is the best unit for measuring the amount of water in a drinking glass?
The best unit of measure to use when measuring the amount of water in a drinking glass is ounces. A liquid measuring cup can be used to measure the ounces of water.
What is the amount of liquid a drinking glass hold?
One drinking glass holds about 230 ml ( milliliters )
How much water can a glass hold?
The amount of water a glass can hold varies depending on the size and shape of the glass. A standard drinking glass typically holds around 8 to 12 ounces of water.
The water in your drinking glass may have once been part of?
The water in your drinking glass may have once been part of one of the Great Lakes. These Great Lakes are in the United States of America.
