Fig. 6
From: Supercooling of Water Controlled by Nanoparticles and Ultrasound
A diagram showing the different effects of ultrasound and nanoparticles on the supercooling degree of water [a Al2O3 nanoparticles, b SiO2 nanoparticles]. The blue, red, and green dots represent that the required supercooling degree for the water solidification with nanoparticles and ultrasound is lower than, equal to, and higher than that with ultrasound individually, respectively