Science Source General Science

A pattern of air flow demonstrating the Bernoulli principle. A wing-shaped object placed in a wind tunnel acts as an airfoil, where the upper surface...

This landscape photo compares infrared film with ordinary film.

This bar at the National Bureau of Standards is the standard meter for all metric measurements of length in this country.

This platinum-iridium cylinder at the National Bureau of Standards is the primary standard kilogram for all metric measurements of mass in this countr...

Two sets of intersecting circular ripples.

Light refracted through a prism.

An image of an astrolabe based on Galileo's model. The astrolabe serves many functions, including surveying, and predicting the positions of stars, pl...

This platinum-iridium cylinder at the National Bureau of Standards is teh primary standard kilogram for all metric measurements of mass in this countr...

The National standard of ass, known as Prototype Kilogram No. 20, is a platinum-iridium cylinder 39mm in diameter and 39mm high. It is an accurate cop...

When water surface is disturbed, circular waves due to surface tension, (if water is shallow), spread out from each point of disturbance and continual...

A drop of milk.

Two balls initially in motion collide. The interaction of these two bodies show that equal and opposite changes in momentum are the rule in nature.

A demonstration of how a rainbow occurs. A ray of light is focused on a plastic sphere on the other side of a screen from a light source and focusing...

The behavior of a shadow.

Interference pattern in a ripple tank.

Interference waves with a straight barrier.

Strobe photograph of a simple pendulum, showing how gravity accelerates the pendulum bob on the downswing and slows it on the upswing.

Demonstrating the principle of parabolic reflection. The most common illustration of this principle is the auto headlight. In the ripple experiment a...

The focal length of a biconvex lens.

Two ripple tank probes vibrating at the same frequency generate two circular wave systems which produce the interference pattern shown.

This make-it-yourself mirror, with small pieces of glass fixed to a convex core, helps simulate a parabolic mirror. The repeated image of an eye serve...

Demonstrating the principle of parabolic reflection. The most common illustration of this principle is the auto headlight. In the ripple experiment a...

Light refraction. When light is incident from a more optically dense medium onto a less optically dense medium (for example, from glass onto air) it r...

A demonstration proving the virtual image of an object is located behind a mirror. The photograph appears to show a lit candle. In reality, it is half...

An experiment on focusing water waves. To focus water waves as a lens focuses light, a convex piece of glass is used in a riple tank. Straight waves f...

Pencils of light pass through a prism and are refracted (bent) to different degrees.

The Foucault Pendulum was installed at the United Nations Headquarters in New York City, NY in 1955. The gold-plated structure weighs 200 lbs. It is s...

A girl places her hands on a Van de Graaf generator, a device that transmits excess electrons. Strands of her hair repel each other because they are s...

Computer-generated model of caffeine.