A mood ring is a finger ring that contains a thermochromic element, or "mood stone", that changes colors based on the temperature of the finger of the wearer. Finger temperature, as long as the ambient temperature is relatively constant, is significantly determined by peripheral blood flow, which is modulated by the autonomic nervous system.[ citation needed ] A mood ring contains liquid crystals that change color depending on the temperature. [1]
The idea to use thermosensitive elements in jewelry first arose from the American jeweler Marvin Wernick in 1974 after reading a magazine article about the use of liquid crystal elements in medical thermometers. [2] He found a compound that changed color from black to green, blue and deep blue in the range of 32–38 °C and in January 1975 developed a technique for using it in pendants and rings. [2] Sales began in February. Wernick called the jewelry "magical", and his promotional materials claimed that the color of the pendant or ring is an indicator of the warmth of the wearer's character. [3] Since Wernick did not patent the invention, other jewelers adopted the idea and began to produce their thermosensitive jewelry. Soon someone came up with a successful term "mood ring", which was quickly adopted by all manufacturers, including Wernick. [4]
An important producer of "mood rings" was Joshua Reynolds; some sources call him their inventor. [5] Reynolds called the rings "a real biofeedback tool" that allows a person to get additional information about their body. [5] In December 1975 the total value of the rings sold reached $15 million. [6] However, in mid-December, the demand for rings suddenly fell as the market was oversaturated, and companies that did not have time to sell rings suffered losses. [7] After a couple of years, "mood rings" went out of fashion. [6]
Liquid crystal (LC) is a state of matter whose properties are between those of conventional liquids and those of solid crystals. For example, a liquid crystal can flow like a liquid, but its molecules may be oriented in a common direction as in solid. There are many types of LC phases, which can be distinguished by their optical properties. The contrasting textures arise due to molecules within one area of material ("domain") being oriented in the same direction but different areas having different orientations. An LC material may not always be in an LC state of matter.
A thermometer is a device that measures temperature or temperature gradient. A thermometer has two important elements: (1) a temperature sensor in which some change occurs with a change in temperature; and (2) some means of converting this change into a numerical value. Thermometers are widely used in technology and industry to monitor processes, in meteorology, in medicine, and in scientific research.
Hypercolor was a line of clothing, mainly T-shirts and shorts, that changed color with heat.
Polychlorotrifluoroethylene (PCTFE or PTFCE) is a thermoplastic chlorofluoropolymer with the molecular formula (CF2CClF)n, where n is the number of monomer units in the polymer molecule. It is similar to polytetrafluoroethene (PTFE), except that it is a homopolymer of the monomer chlorotrifluoroethylene (CTFE) instead of tetrafluoroethene. It has the lowest water vapor transmission rate of any plastic.
North India is a loosely defined region consisting of the northern part of India. The dominant geographical features of North India are the Indo-Gangetic Plain and the Himalayas, which demarcate the region from the Tibetan Plateau and Central Asia.
Thermochromism is the property of substances to change color due to a change in temperature. A mood ring is an excellent example of this phenomenon, but thermochromism also has more practical uses, such as baby bottles which change to a different color when cool enough to drink, or kettles which change color when water is at or near boiling point. Thermochromism is one of several types of chromism.
Thermochromic ink is a type of dye that changes color when temperatures increase or decrease. It was first used in the 1970's within novelty toys like mood rings, but has found some practical uses in things such as thermometers, product packaging, pens. This ink has also found applications within the medical field for specific medical simulations in medical training. Thermochromic ink can also turn transparent when heat is applied; an example of this type of thermochromic ink is found on corners of an examination mark sheet. This proves that the sheet has not been edited or photocopied, and also on certain pizza boxes to show the temperature of the product.
A Mangalsutra, or Tali, is a necklace that the groom ties around the bride's neck in the Indian subcontinent, in a ceremony called Mangalya Dharanam within a Hindu wedding. The necklace serves as a visual marker of status as a married Hindu woman.
Nursing assessment is the gathering of information about a patient's physiological, psychological, sociological, and spiritual status by a licensed Registered Nurse. Nursing assessment is the first step in the nursing process. A section of the nursing assessment may be delegated to certified nurses aides. Vitals and EKG's may be delegated to certified nurses aides or nursing techs. It differs from a medical diagnosis. In some instances, the nursing assessment is very broad in scope and in other cases it may focus on one body system or mental health. Nursing assessment is used to identify current and future patient care needs. It incorporates the recognition of normal versus abnormal body physiology. Prompt recognition of pertinent changes along with the skill of critical thinking allows the nurse to identify and prioritize appropriate interventions. An assessment format may already be in place to be used at specific facilities and in specific circumstances.
Harry Winston was an American jeweler. He donated the Hope Diamond to the Smithsonian Institution in 1958 after owning it for a decade. He also traded the Portuguese Diamond to the Smithsonian in 1963 in exchange for 3,800 carats of small diamonds.
A ring is a round band, usually made of metal, worn as ornamental jewelry. The term "ring" by itself always denotes jewellery worn on the finger; when worn as an ornament elsewhere, the body part is specified within the term, e.g., earrings, neck rings, arm rings, and toe rings. Rings always fit snugly around or in the part of the body they ornament, so bands worn loosely, like a bracelet, are not rings. Rings may be made of almost any hard material: wood, bone, stone, metal, glass, gemstone or plastic. They may be set with gemstones or with other types of stone or glass.
A medical thermometer or clinical thermometer is a device used for measuring a human's or animal's body temperature. The tip of the thermometer is inserted into the mouth under the tongue, under the armpit, into the rectum via the anus, into the ear, or on the forehead.
Nightflyers is a science fiction horror novella by American writer George R. R. Martin, released as a short novella in 1980 and as an expanded novella in 1981. A short story collection of the same name was released in 1985 that includes the expanded novella. In 1987, the short novella was adapted into a film by the same name. A 2018 television adaptation of the extended novella was developed; television presentation began on December 2, 2018, on the SyFy Channel.
Native American jewelry refers to items of personal adornment, whether for personal use, sale or as art; examples of which include necklaces, earrings, bracelets, rings and pins, as well as ketohs, wampum, and labrets, made by one of the Indigenous peoples of the United States. Native American jewelry normally reflects the cultural diversity and history of its makers, but tribal groups have often borrowed and copied designs and methods from other, neighboring tribes or nations with which they had trade, and this practice continues today. Native American tribes continue to develop distinct aesthetics rooted in their personal artistic visions and cultural traditions. Artists may create jewelry for adornment, ceremonies, and display, or for sale or trade. Lois Sherr Dubin writes, "[i]n the absence of written languages, adornment became an important element of Indian communication, conveying many levels of information." Later, jewelry and personal adornment "...signaled resistance to assimilation. It remains a major statement of tribal and individual identity."
A sugar cane mill is a factory that processes sugar cane to produce raw sugar or plantation white sugar. Some sugar mills are situated next to a back-end refinery, that turns raw sugar into (refined) white sugar.
Tacori is an American jewelry design house and manufacturer based in Glendale, California. The brand is heavily associated with bridal jewelry.
Titanium in zircon geothermometry is a form of a geothermometry technique by which the crystallization temperature of a zircon crystal can be estimated by the amount of titanium atoms which can only be found in the crystal lattice. In zircon crystals, titanium is commonly incorporated, replacing similarly charged zirconium and silicon atoms. This process is relatively unaffected by pressure and highly temperature dependent, with the amount of titanium incorporated rising exponentially with temperature, making this an accurate geothermometry method. This measurement of titanium in zircons can be used to estimate the cooling temperatures of the crystal and infer conditions during which it crystallized. Compositional changes in the crystals growth rings can be used to estimate the thermodynamic history of the entire crystal. This method is useful as it can be combined with radiometric dating techniques that are commonly used with zircon crystals, to correlate quantitative temperature measurements with specific absolute ages. This technique can be used to estimate early Earth conditions, determine metamorphic facies, or to determine the source of detrital zircons, among other uses.
Ancient Roman jewelry was characterized by an interest in colored gemstones and glass, in contrast with their Greek predecessors who focused primarily on the production of high-quality metalwork by practiced artisans. Extensive control of Mediterranean territories provided an abundance of natural resources to utilize in jewelry making. Participation in trade allowed access to both semi-precious and precious stones that traveled down the Persian Silk Road from the East.
The prehistory of New England is an important topic of research for New England archaeologists. Humans reached the current-day New England region by at least 10,500 years ago and likely earlier, occupying a recently de-glaciated environment. Pre-contact Native American groups in New England did not have full-fledged market economies and physical artifacts tended to change very slowly. However, technological shifts brought agriculture and ceramics to the region prior to the arrival of European settlers in the 17th century.
Promethium compounds are compounds containing the element promethium, which normally take the +3 oxidation state. Promethium belongs to the cerium group of lanthanides and is chemically very similar to the neighboring elements. Because of its instability, chemical studies of promethium are incomplete. Even though a few compounds have been synthesized, they are not fully studied; in general, they tend to be pink or red in color. Treatment of acidic solutions containing Pm3+ ions with ammonia results in a gelatinous light-brown sediment of hydroxide, Pm(OH)3, which is insoluble in water. When dissolved in hydrochloric acid, a water-soluble yellow salt, PmCl3, is produced; similarly, when dissolved in nitric acid, a nitrate results, Pm(NO3)3. The latter is also well-soluble; when dried, it forms pink crystals, similar to Nd(NO3)3. The electron configuration for Pm3+ is [Xe] 4f4, and the color of the ion is pink. The ground state term symbol is 5I4. The sulfate is slightly soluble, like the other cerium group sulfates. Cell parameters have been calculated for its octahydrate; they lead to conclusion that the density of Pm2(SO4)3·8 H2O is 2.86 g/cm3. The oxalate, Pm2(C2O4)3·10 H2O, has the lowest solubility of all lanthanide oxalates.