THE chromatographic separation of argon and oxygen is difficult, and existing methods depend on one of the following techniques: (1) Separation on a molecular sieve 5 Å column at 18° C (ref.

Prime numbers are divisible only by 1 and themselves. They serve as the “atoms” of mathematics, capable of decomposing other numbers into factors (like 12 = 2 × 2 × 3). As numbers increase, ...

This method not only offers a practical solution ... select a pot and a metal sieve that fit together well. The sieve should be large enough to rest snugly on the pot without the risk of it ...

The principle of filtering materials based on size is well known: a sieve lets fine particles pass ... in mussels—using an ...