Search results
Results from the WOW.Com Content Network
Comparison of three different types of bubbles: normal bubbles on the surface (top left), antibubbles on the surface (right), and submerged air bubbles within the largest of those antibubbles. The behavior of antibubbles differs from that of air bubbles in three primary ways, and provides a ready means of identification:
A filter bubble or ideological frame is a state of intellectual ... that perhaps could enable researchers to compare and contrast the agencies of the two ...
Contrast in ultrasound imaging relies on the difference in acoustic impedance, a function of both the speed of the ultrasound wave and the density of the tissues, [12] between tissues or regions of interest. [5] As the sound waves induced by ultrasound interact with a tissue interface, some of the waves are reflected back to the transducer.
A bubble echocardiogram is an extension of this that uses simple air bubbles as a contrast medium during this study and often has to be requested specifically. Although colour Doppler can be used to detect abnormal flows between the chambers of the heart (e.g., persistent (patent) foramen ovale), it has a limited sensitivity. When specifically ...
Air bubbles rising from a scuba diver in water A soap bubble floating in the air. A bubble is a globule of a gas substance in a liquid. In the opposite case, a globule of a liquid in a gas, is called a drop. [1] Due to the Marangoni effect, bubbles may remain intact when they reach the surface of the immersive substance.
Contrast-enhanced ultrasound in medicine applies microscopic bubbles for imaging and therapy. Coalescence of ultrasound contrast agent microbubbles is studied to prevent embolies [1] or to block tumour vessels. [2] Microbubble coalescence has been studied with the aid of high-speed photography. [3]
A soap bubble Girl blowing bubbles Many bubbles make foam. A soap bubble (commonly referred to as simply a bubble) is an extremely thin film of soap or detergent and water enclosing air that forms a hollow sphere with an iridescent surface. Soap bubbles usually last for only a few seconds before bursting, either on their own or on contact with ...
A video showing water being boiled. As boiling proceeds, more nucleation sites (where bubbles are formed) can be seen. Nucleate boiling is characterised by the growth of bubbles or pops on a heated surface (heterogeneous nucleation), which rises from discrete points on a surface, whose temperature is only slightly above the temperature of the ...