Brass ball doesn't fit through brass ring until ring is heated.
Most solids (see Comments) expand when heated due to increased atomic and lattice vibrations. In this demo, a brass ring expands when heated to let a previously too small a ball...
One of the more important discoveries in modern physics is the production of isotopes (both radioactive and stable) by the capture of neutrons. 1 In this experiment the bombardment of silver by thermalized neutrons produces short lived...
If you're feeling pressure to do something fun, consider the vacuum cannon...
See slow-motion footage of the Vacuum Cannon in action (https://youtu.be/gex5Fq5oUtc)
Air rushing into an evacuated tube pushes a ping-pong ball down the...
The thermal radiation emitted from a black body is temperature dependant. The tungsten filament of a bulb approximates a black body, and by increasing the current through the bulb, its temperature rises and so its color spectrum shifts to...
Radiations originating from atomic and nuclear processes are classified into four types:
charged particulate radiation consisting of
1. heavy charged particles (α)
2. fast electrons (β)
uncharged radiation consisting of
3. electromagnetic...
Hot fluid rises, cool fluid sinks. Here is a desktop convection cell modeling the processes in the atmosphere, oceans or stellar interiors.
The currents are set up in rheoscopic fluid[1] (basically minute aluminum flakes in...
Black body radiators in thermal equilibrium should emit the same spectrum of radiation; inside a muffle furnace at high temperature, objects should appear the same color, whatever their material.
Place a piece of brick and an...
A beam of cathode rays (electrons) impinging on a paddle wheel cause it to spin and travel down the vacuum tube.
A paddle wheel is suspended by its axle inside a Crookes tube so that when the paddle vanes spin the entire wheel is free to...
Smoke cell under microscope; smoke particles seen bombarded by air molecules.
Brownian motion shows direct evidence of the incessant motion of matter due to thermal energy. Here we use the random bombardment of smoke particles by air...
Room temperature water boils in an evacuated bell jar and then freezes due to rapid surface evaporation.
