A kettle containing boiling water changes water into steam at 100^{\circ}C. In comparison with the water lost by boiling, how do the mass and the volume of the steam formed compare?
- Amass of steam: same as water; volume of steam: same as water
- Bmass of steam: same as water; volume of steam: greater than water
- Cmass of steam: less than water; volume of steam: same as water
- Dmass of steam: less than water; volume of steam: greater than water