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A measure of the concentration of a substance in the air, expressed as parts per million (ppm).

The time-weighted average concentration of a substance in the air over a specified period, typically an 8-hour workday.

The lowest concentration of a flammable substance in air that will support combustion.

The concentration of a substance in the air that is considered safe for most workers to breathe for an 8-hour workday.

A formula used to calculate the combined effect of multiple hazardous substances in the air.

A formula that relates pressure, volume, and temperature of a gas.

A set of formulas that relate voltage, current, and resistance in an electrical circuit.

The inverse proportionality between resistance and current in a circuit. Higher resistance leads to lower current flow.

The intensity of radiation decreases with the square of the distance from the source.

Calculates the remaining radioactivity after a given time, using the disintegration constant and time elapsed.

Same calculation as N formula but uses the half-life of the radionuclide.

Calculates the half-life of a radionuclide based on its disintegration constant.

The circumference of a circle is calculated by multiplying the diameter by pi.

The area of a circle is calculated by multiplying pi by the square of the radius.

The volume of a tank is calculated by multiplying the area of its base by its height.

A trigonometric function that calculates the ratio of the opposite side to the hypotenuse in a right triangle.

A mathematical function used to calculate the average, spread, and relationship between data points.

A function on a calculator that changes the sign (positive or negative) of a number or exponent.

A function that raises any number to any power.

A way of writing very large or very small numbers using exponents.

A function that calculates the number of ways to choose a certain number of items from a set, without regard to order.

The centerline velocity of air entering a hood, measured in feet per minute (fpm) at a distance 'x' from the hood opening.

The volumetric flow rate of air through a hood, measured in cubic feet per minute (cfm).

The distance from the plane of the hood opening to the point where Capture Velocity is measured, measured in feet (ft).

The area of the hood opening, measured in square feet (ft²).

A measure of heat stress, taking into account wet bulb temperature, globe temperature, and dry bulb temperature.

The formula used to calculate WBGT in an environment without direct sunlight.

The formula used to calculate WBGT in an environment with sunlight exposure.

The sound power level measured in decibels (dB), representing the total acoustic power emitted by a sound source.

The sound pressure level measured in decibels (dB), representing the intensity of sound pressure at a specific point.

A rule that states that every doubling of the distance from a noise source reduces the sound pressure level by 6 dB.

The coefficient of correlation, often denoted by 'r', measures the strength and direction of the linear relationship between two variables. It ranges from -1 to +1. A value of 1 indicates a perfect positive correlation, -1 indicates a perfect negative correlation, and 0 indicates no correlation.

The z-score is a standardized measure of how many standard deviations a data point is away from the mean. It is calculated by subtracting the mean from the data point and dividing by the standard deviation.

The probability of failure, denoted as P₁, is calculated as 1 minus the reliability (R(t)) at a specific time (t). It represents the likelihood that a system or component will fail within that given timeframe.

Reliability, denoted as R(t), signifies the probability that a system or component will perform its intended function without failure within a specified period of time (t). It's calculated using an exponential function with the failure rate (λ) and time (t).

The failure rate, denoted by λ, is the reciprocal of the mean time between failures (MTBF). It represents the average number of failures per unit time.

The Poisson distribution (P) is a discrete probability distribution that describes the probability of observing a specific number of events (r) in a fixed period of time or space, given a known average rate of events (λ).

The sample standard deviation (S) measures the spread or variability of data points in a sample. It is calculated using the formula S = √(Σx²/ (n-1)). X represents each data point, X is the sample mean, and n is the sample size.

The pressure drop (P) across a length of pipe can be calculated using the formula P = (4.52 Q¹.⁸⁵) / (C¹.⁸⁵ 4.87d). It takes into account the flow rate (Q), the coefficient of roughness (C), and the pipe's internal diameter (d).

The flow rate (Q) through a pipe can be calculated using the formula Q = (Q²/0.54(S-R₂)). This formula involves the static pressure (S) and the residual pressure (R).

The pressure velocity (P) in a pipe is calculated using the formula P = (Q²/ 891d⁴). This formula involves the flow rate (Q) and the pipe's internal diameter (d).