A Foucault pendulum is a simple device that demonstrates the rotation of the Earth. It consists of a large pendulum that swings freely in any direction, and over time, it appears to rotate relative to the surface of the Earth. This phenomenon is a result of the Earth's rotation underneath the pendulum's path. The list of Foucault pendulums typically includes notable locations around the world where such pendulums are installed.

The term "centroid" can refer to different concepts depending on the context, but generally, it denotes a point that represents the center or average of a geometric shape or a set of points. Here are a few contexts where centroids are commonly used: 1. **Geometry**: In a geometric shape (like a triangle, rectangle, or polygon), the centroid is the point where all the medians intersect.

Heliophysics is the study of the Sun and its interactions with the solar system, including the solar wind, magnetic fields, and the impact on space weather and planetary atmospheres. Numerous missions have been launched to study various aspects of heliophysics.

General relativity fundamentally changed our understanding of gravitation and spacetime, but it also led to modifications and extensions of various physical theories to incorporate the effects of gravity in a relativistic framework. Here are some key areas where general relativity has prompted modifications or expansions of existing physical theories: 1. **Newtonian Gravity**: Newton's law of universal gravitation was revised by general relativity, particularly by describing gravity not as a force but as a curvature of spacetime caused by mass.

The K band is a designation used in the electromagnetic spectrum and is commonly associated with both microwave and infrared portions of the spectrum, depending on the context. In the context of infrared radiation, K band typically refers to a specific range of wavelengths or frequencies. In infrared terms, the K band generally covers wavelengths from about 18 to 27 micrometers (μm).

The term "liquid whistle" is not widely recognized, and its meaning may vary depending on the context in which it is used. Here are a few possibilities: 1. **Whistle Made from Liquid**: It could refer to a type of musical instrument or sound-producing device that generates sound through the manipulation of liquid, such as a water whistle or a similar instrument that uses water to create sound.

The "Parabola of Safety" is a conceptual framework used primarily in safety management and risk assessment, particularly in fields like engineering, aviation, and industrial safety. It visually represents the relationship between safety measures, risk levels, and the concept of acceptable risk. The parabola typically shows how safety increases as safety measures and improvements are implemented, while also illustrating the diminishing returns of these measures.