To convert a density from grams per milliliter (g/mL) to kilograms per cubic meter (kg/m³), we follow these conversion steps:

1. Convert grams to kilograms:
   $1 \, \text{g} = 0.001 \, \text{kg}$.

2. Convert milliliters to cubic meters:
   $1 \, \text{mL} = 1 \times 10^{-6} \, \text{m}^3$.

Conversion calculation:

Given:
$0.987 \, \text{g/mL}$.

Convert to kilograms per cubic meter (kg/m³):

$0.987 \, \text{g/mL} = 0.987 \times \frac{0.001 \, \text{kg}}{1 \, \text{g}} \times \frac{1 \, \text{mL}}{1 \times 10^{-6} \, \text{m}^3}$

$= 0.987 \times 1000 \, \text{kg/m}^3$

$= 987 \, \text{kg/m}^3$

Final Answer:

The density is $987 \, \text{kg/m}^3$.

Would you like more details or have any questions?

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Here are five related questions for practice:

1. How would you convert 1.5 g/mL to kg/m³?
2. What is the density of water in kg/m³ if it is 1 g/mL?
3. Convert 1200 kg/m³ to g/mL.
4. If a substance has a density of 0.8 g/mL, what is it in kg/m³?
5. How would you convert 2.3 kg/L to kg/m³?

Tip: Always ensure consistency in units when converting—especially between different volume measures like milliliters and cubic meters.