Researchers have recently used an array of SQUIDs to produce photons in this medium, and electron interaction with this medium accounts for the small energy difference between the 2s and 2p energy levels. Particle interactions between a pair of metal plates in this medium is described in the (*) Casimir effect, and evaporation into this medium is known as outgassing. This medium sets a benchmark f
Researchers have recently used an array of SQUIDs to produce photons in this medium, and electron interaction with this medium accounts for the small energy difference between the 2s and 2p energy levels. Particle interactions between a pair of metal plates in this medium is described in the (*) Casimir effect, and evaporation into this medium is known as outgassing. This medium sets a benchmark for the speed of light, and it is where true freefall occurs. Often achieved in laboratories by using an air pump, this medium is approximated by outer space. For ten points, give this condition that describes a space devoid of matter.
Researchers have recently used an array of SQUIDs to produce photons in this medium, and electron interaction with this medium accounts for the small energy difference between the 2s and 2p energy levels.
vacuum [prompt on "free space"]