An echocardiogram (echo=sound + card=heart + gram=drawing) is an ultrasound test that can evaluate the structures of the heart, as well as the direction of blood flow within it. Technicians specially trained in echocardiography produce the images and videos, often using a special probe or transducer that is placed in various places on the chest wall, to view the heart from different directions.
Cement powder is usually mixed with sand and aggregate (gravel, granite) and when needed, they are mixed with water to form concrete. Figures 4 and 5 Builders and masons, prior to the use of modern cement, used a mixture of lime (calcium hydroxide), sand and water, known as lime mortar or simply mortar.
Making the world better, one answer at a time. Carbon hydroxide or slaked lime is used as an alkalie to neutralise th PH of acidic lakes and streams.