meaningful measurement
101Logic and the philosophy of mathematics in the nineteenth century — John Stillwell INTRODUCTION In its history of over two thousand years, mathematics has seldom been disturbed by philosophical disputes. Ever since Plato, who is said to have put the slogan ‘Let no one who is not a geometer enter here’ over the… …
102Lymphedema — Classification and external resources ICD 10 I89.0, I97.2, Q82.0 …
103Oxygen — This article is about the chemical element and its most stable form, O2 or dioxygen. For other forms of this element, see Allotropes of oxygen. For other uses, see Oxygen (disambiguation). nitrogen ← oxygen → fluorine ↑ O ↓ …
104Psychology — (from Greek gr. ψῡχή, psȳkhē , breath, life, soul ; and gr. λογία, logia ) is an academic and applied discipline involving the scientific study of mental processes and behavior. Psychologists study such phenomena as perception, cognition, emotion …
105Turbidity — standards of 5, 50, and 500 NTU Turbidity is the cloudiness or haziness of a fluid caused by individual particles (suspended solids) that are generally invisible to the naked eye, similar to smoke in air. The measurement of turbidity is a key… …
106Heart rate — is the number of heartbeats per unit of time, typically expressed as beats per minute (bpm). Heart rate can vary as the body s need to absorb oxygen and excrete carbon dioxide changes, such as during exercise or sleep. The measurement of heart… …
107History of perpetual motion machines — The history of perpetual motion machines dates back to the Middle Ages. For millennia, it was not clear whether perpetual motion devices were possible or not, but the development of modern thermodynamics has indicated that they are impossible.… …
108Pixel density — Pixels per inch (PPI) or pixel density is a measurement of the resolution of devices in various contexts; typically computer displays, image scanners or digital camera image sensors.PPI can also describe the resolution in pixels, of an image to… …
109Age of the universe — The age of the universe is the time elapsed between the theory of the Big Bang and the present day. Current observations suggest that this is about 13.73 billion years, with an uncertainty of about +/ 120 million years. The lowering of the… …
110Holism in science — Holism in science, or Holistic science, is an approach to research that emphasizes the study of complex systems. This practice is in contrast to a purely analytic tradition (sometimes called reductionism) which aims to gain understanding of… …
