What is the value of one billion (short scale) written in scientific notation?

1 x 10^9

The short scale system, used in the U.S. and modern U.K., defines a billion as a thousand millions, which is written as a one followed by nine zeros. A helpful way to remember this is that the exponent '9' in scientific notation directly corresponds to those nine zeros. While this is standard in English, many other countries use the long scale, where a billion actually represents a million millions.