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:
One drinking glass holds about 230 ml ( milliliters )
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.
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.
Put cold water inside the glasses. Dip the outer glass into hot water. The outer glass expands, the inner glass contracts.
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.
Drinking wine and water
After drinking a glass of water, it typically takes about 30 minutes to 2 hours for the water to reach your bladder.
It typically takes about 30 minutes for someone to urinate after drinking a glass of water.
because the glass will pop if you put the very hot water into the glass
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.
Drinking water does burn calories and drinking an 8-ounce glass of cold water burns 9.25 calories more than drinking room temperature water.
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.
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.
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.
One drinking glass holds about 230 ml ( milliliters )
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 one of the Great Lakes. These Great Lakes are in the United States of America.