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About these units
Attoliter (aL)
An attoliter is a staggering 10⁻¹⁸ liters, placing it firmly in the realm of molecular and nanoscale science. This unimaginably small volume corresponds to spaces comparable to the inside of viruses, nanopores, or clusters of biomolecules. Cutting-edge technologies like nano-droplet reactors, atomic force microscopy, and high-precision spectroscopy rely on attoliters to describe reaction chambers or sample sizes. The attoliter is so small that even a single bacterial cell has a volume approximately one million attoliters. This makes the unit essential for exploring the physical limits of chemical reactions and biological processes.
Cord (cd)
The cord is a large unit used in North America to measure firewood, defined as a neatly stacked pile measuring 128 cubic feet (usually arranged as 4 ft × 4 ft × 8 ft). Its strict definition helps prevent fraud in firewood sales and ensures fairness in trade. The cord accounts for both wood and air space, though the amount of actual wood can vary depending on how tightly it is stacked. Despite the prevalence of metric units worldwide, the cord remains a robust standard in forestry, firewood commerce, and rural heating practices across the US and Canada.