Write the following statement in standard form. a) The density of aluminium is 2710 kgm⁻³ b) Poisson's ratio for gold is 0.44 c) The impedance of free space is 376.73

The number is 2710.

Move the decimal point 3 places to the left: 2.710.

Since the decimal point was moved 3 places to the left, the power of 10 is 3.
The density of aluminium is $\boxed*{2.710 \times 10^3 \text{ kgm}^{-3}}$.

The number is 0.44.

Move the decimal point 1 place to the right: 4.4.

Since the decimal point was moved 1 place to the right, the power of 10 is $-1$.
Poisson's ratio for gold is $\boxed*{4.4 \times 10^{-1}}$.

The number is 376.73.

Move the decimal point 2 places to the left: 3.7673.

Since the decimal point was moved 2 places to the left, the power of 10 is 2.
The impedance of free space is $\boxed*{3.7673 \times 10^2}$.