Discover the expert in you.
Discover the expert in you.
Estimation is the process of making an educated guess or an approximate prediction of the value, number or quantity of the material or objects in question. The estimation process depends on rounding the values up or down in order to facilitate working with the numbers. Approximation can be applied to quantities and measurements, calculations and solving problems.
Thermocouples are devices used to measure temperature. The thermocouple works by using two dissimilar metals that produce an electrical current. The changes in temperature affect the voltage output of the thermocouples. These sensor junctions come in a variety of configurations, including grounded and ungrounded. The differences between grounded and ungrounded thermocouples are significant in design, functionality and in their use among different environments.
Spectrophotometry is a related field to spectroscopy. Each is a technology for inferring information by measuring and sometimes manipulating light with extreme precision. Spectrophotometer measures light in the visible scope of wavelengths. It measures the degree to which visible light passes through or reflects off of proteins. It is a highly accurate method for identifying and measuring algae.
While temperature is often measured in degrees using the Celsius, Kelvin or Fahrenheit scales, temperature may also be measured in millivolts. Millivolts represent one-thousandth of a volt and are produced by thermocouples. Thermocouples are junctions between two different types of metal. The voltage created by the two different metals in the thermocouple can be used to calculate temperature. Fortunately, there are a variety of different tools that can all perform the conversion of temperature to millivolts.
Logarithm is a mathematical operator used to represent a number in terms of a base and an exponent. For example, the base 10 logarithm of 100 is 2 since 10 will have to be raised to the power of 2 to get 100. Similarly, the base 10 logarithm of 10,000 is 4. Although, logarithm of any base can be defined, the most commonly used logarithm is of base 10. The main advantage of using logarithm is that a very large number can be represented by a small number. Logarithm is often used in charting since it allows representation of highly…
The change of heat in a given chemical reaction is called enthalpy. Reactions can be divided into two major categories in terms of heat exchange. The notation for enthalpy is delta H, a small triangle pointing upward followed by the letter "H." Endothermic reactions are those that feel cold to the touch as energy is being gained by the system, delta H is positive. Exothermic reactions are hot to the touch as the energy leaves the chemical system and enters the environment, which has a negative delta H. The amount of enthalpy can be calculated using Hess's Law.
Exponentials are functions where the base is a known constant and the exponent is the variable. For example, f(x) = 3^x. The mathematical opposite of exponentials are logarithms. An exponential of y = b^x where "b" gets placed into the logarithmic form of logb(y) = x, where "b" is written as a subscript. This is read as "log base 'b' of 'y' equals 'x'". The "y" value in the logarithm is also called the argument.
A logarithm is a type of mathematical function. To understand what a logarithm is, consider the equation x=b^y. You can solve this equation for y by taking the logarithm of x, to the base b. In other words, y is equal to the log base b of x. If you are trying to solve a mathematical equation with complex logarithmic expressions in it, then you can simplify the equation by using the logarithmic identities.
Thermocouples are devices made of two joined strips of metal that take advantage of the thermocouple effects occurring when different kinds of metal are joined. The thermocouple effects demonstrate that when the temperature between the two metals is different, a voltage is produced; conversely, if a voltage is applied to the metals, a temperature difference is created. This simple, practical conversion between power and temperature has numerous uses.
In geometry, angles are measured in degrees and fractions of a degree, such as minutes and seconds. It follows that 1 degree equals to 60 minutes while 1 minute contains 60 seconds. Hence 1 degree also comprises 3,600 (60 x 60) seconds. For many calculations, it's necessary to convert an angle value to the decimal form; for example, the angular fraction of 15 minutes equals to 0.25 of a degree in the decimal notation.
A spectrophotometer is used to determine the concentration of certain compounds, such as protein, in a solution. In general, a light shines through a cuvette filled with a sample. The amount of light that is absorbed by the sample is measured. Since compounds absorb light in different spectral ranges, the right wavelength must be set for the analysis. There are numerous ways to calculate the concentration of unknown samples through spectrophotometry, however using reference standards gives the best accuracy. Furthermore, standards also indicate if the spectrophotometer is malfunctioning or other problems with the analysis.
The standard heat of formation is the amount of enthalpy -- a measure of heat -- that is created when 1 mole of a compound is created in its standard state. The standard state is the most stable form of an element at 35 degrees Celsius and 1 bar of pressure. It is calculated primarily for compounds in reactions since the standard heat of formation for each element is zero by definition. When expressing the reaction, it is customary to note the state of each reactant and product.
The National Institute of Standards and Technology (NIST) publishes polynomial equations to convert thermocouple temperature in degrees Celsius to voltage in millivolts, and has a database of coefficients based on the temperature range. To convert between the two, you need to look up the coefficients and calculate the result of the equation.
Lake retention time is a measure of how long an average molecule of water stays in a particular lake. It depends on the volume of the lake and the amount of water flowing in and out of the lake. Lake retention times are important for understanding the spread of pollutants, as well as conceptualizing the overall water cycle. The calculation assumes a well-mixed lake. In reality, water in especially large or deep lakes does not mix very well, so it is more difficult to determine an accurate retention time.
Calibration curves are used to determine the concentration of unknown substances based on previous measurements of solutions of known concentrations. The precision and accuracy of the measurements are dependent on the calibration curve. The better the curve the more accurate the answer, the worse the curve the worse the accuracy. This is a type of comparison method, the unknown is compared to a known. Calibration curves are used for all types of measurements using many different machines. This example uses a spectrophotometer.
A nanokatal per gram refers to the catalytic activity of an enzyme. To determine this catalytic activity, the rate of the conversion and experiment parameters must be set. A katal per gram of trypsin enzyme is the amount of trypsin needed to catalyze bonds when certain conditions are met. When the conditions change, the number of bonds that are catalyzed will change. It is easiest to calculate the enzyme unit and then convert this to nanokatals per gram.
A population growing at a steady rate increases slowly at first, but in absolute numbers, it can grow explosively after a time. For example, a population of just 10 people, growing at a rate of 10 percent per year, will double to 20 in about seven years. In 20 years, it grows almost eight times as large. You can use an exact formula to calculate a population's doubling time for a given growth rate. You can also use a rule of thumb to make a fast approximation. You'll need a scientific calculator to compute logarithms for the exact method.
Big game, waterfowl, upland game birds and furbearers are hunted throughout the United States in a variety of habitats. Opinions vary about the best time to hunt. The legal time to hunt is set by state game regulations. Often, the hunting period extends from 30 minutes prior to sunrise to 30 minutes after sunset. Hunting success may be best when the wildlife is moving. There are several factors correlated to wildlife movement and the calculation of peak hunting times.
Create your own estimated time of arrival (ETA) by using your speed and distance to calculate your travel time. Other unexpected factors could come into play to make your estimate inaccurate such as a traffic jam, but a calculated travel time provides only an estimate. Use the travel time formula to calculate how long it will take you to go a specific distance or how long it took you to travel.
A typical full-time hourly position requires that employees work eight hours a day, Monday to Friday; overtime might be a possibility. If you are self-employed, your schedule might be longer or shorter. If you are part-time, you will have fewer hours than a full-time worker and your workdays might vary. Regardless of your schedule, there is a general method to calculate your work time.
Time dilation, sometimes called time warping, occurs as an object travels closer to the speed of light than its observer. From the observer's point of view, the time affecting the traveling object will dilate, meaning it will expand or become slower. Thus the object traveling faster will age slower. Time dilation is often thought to be a function of an object's acceleration, but it is in fact a function of its velocity. Acceleration, which is defined as a change in velocity, can be taken into account to calculate a change in time dilation.
Finding your ascendant requires plotting your birth date, time and location on an astrological chart. Calculate your rising sign with insight from an experienced and certified astrologer in this free video on astrological calendars.
Reaction time is the measure of time for how long it takes a person to react to a stimulus. In other words, it is the amount of time it takes for a certain stimulus to travel through the person's sensory receptors--usually a person's eyes--into their brain, and then into the body to react to the stimulus. You can calculate a person's reaction time using simple household items.
The equinox happens twice a year and refers to the exact time when the sun crosses the celestial equator, causing day and night to be of equal length. It's also the moment that marks the beginning of spring and the start of fall. Several online sites help you to calculate that precise date and time.
A sunset occurs when your exact location on the Earth is shadowed from the sun. In other words, when the Earth rotates away from the Sun, the sunset occurs when your location is no longer in sight of our nearest star. Calculating the sunset time is an interesting and useful skill to have and, despite popular belief, you do not need to be an astronomer to be able to do it. Those who can calculate sunset times can also plan fun activities around this beautiful phenomenon and can also lead to unforgettable events.
Time is traditionally expressed in hours, minutes and seconds. This format is convenient for general use, but is inappropriate in mathematical operations. Calculations typically require the expression of a time interval in decimal form. For instance, 30 minutes equal 0.5 hour and 45 seconds equal 0.75 minute. As an example, we will convert 5 hours, 27 minutes, 56 seconds to decimal form.
Annie, longtime astrology and co-owner of astrology information site Cafe Astrology, says, "The Ascendant (or rising sign) is often considered the mask one wears when meeting others. Perhaps it is most aptly thought of as the automatic responses to one's environment." Without the ascendant, astrology can seem like it doesn't fit or makes no sense. By reading both the ascending sign and Sun sign horoscopes, one can get a better idea of upcoming events and character than by reading just the Sun sign alone.
New breakthroughs in science, such as the completion of the human genome project, define milestones in biology. The project was accomplished in February 2001 and provided new knowledge, such as a reference to determining features that provides a distinction in every individual. To assist the human genome project, SNPs, or single-nucleotide polymorphisms, were identified to distinguish the unique genetic differences of each individual.
Working with show cattle can be a stressful yet rewarding venture. Each calf has its own personality and some of the best can be easy frightened, especially during the show. There are several ways to train your calf to be calm during the show.
A road trip can be fun, but it often takes some planning to make sure that it remains enjoyable. When planning a road trip, one of the most important pieces of information you will want to know is the time that you will need to allot for travel. The process of calculating the round trip time involves gathering some data and performing a couple of simple calculations.
Thermocouples are temperature sensors that are made from two metal alloys. When the two metals are brought together to form a junction, a voltage is generated when there are temperature differences between them. This is known as the Seebeck effect.
John Napier (1550-1617) wanted people to remember him as a devout Scottish Presbyterian who defied the Roman Catholic rule in Scotland. Instead, history has remembered him for his hobby of number games. First, he created "Napier's bones," a device that made multiplication and division, especially of large numbers, as easy as simple addition and subtraction. The other device Napier created to aid in multiplication was the logarithm.
The sun's core, the innermost layer of the sun, is plasma, a type of gas that is sensitive to magnetism. The sun's energy is derived from its core. Fusion reactions that occur in the core release extreme amounts of heat and energy in the form of gamma rays and neutrinos.
When learning basic mathematics, knowing each operator is necessary for each calculation. A mathematical equation has several basic operators. These operators are used in everyday life, making math a necessity. Although there are several more complex operators in math, simple math functions lay a foundation for more complicated calculations.
The enthalpy (abbreviated as dH) of a reaction indicates amount of heat absorbed (dH >0) or released (dH<0) in this chemical reaction. Enthalpies of reactions are usually computed from enthalpies of formation of reagents at standard conditions (pressure of 1 bar and temperature 25 degrees Celsius). For the purposes of explaining this principle of thermodynamics, we will calculate the enthalpy of the reaction for methane (CH4) combustion in the following steps.
The sun is a typical star that just happens to be at the center of our solar system. The sun is located on the outer spiral arms of the Milky Way galaxy. The sun is so huge in comparison to the other bodies that orbit it that it actually comprises 98.86 percent of the mass of the entire solar system. The sun is constantly undergoing nuclear reactions within its core that produce incredible amounts of energy.
Depending on what is most important to you, you'll want to make sure you have a secure, safe way to store your valuables. Combination locks are a thrifty and efficient way to secure all of your prized and valuable possessions. However, if you've had problems in the past opening your lock, this will provide helpful insights to solve your lock problems. Issues like stuck combination faces and sticky locking mechanisms are addressed below!
Gambling is an addiction as bad as any other. People who gamble compulsively risk losing everything, and recognizing the signs of a gambling problem is imperative to head off disaster.
We have all heard about earthquakes in the news. And, always, the epicenter of the earthquake is given. However, if you have ever wondered how scientists figure out the epicenter of an earthquake, there are some simple steps anyone can follow to figure it out.
