Tools for Calculations & Analyses

The world’s largest collection of open access research papers

Basic engineering data. SI-system, unit converters, physical constants, drawing scales and more.

Moist and humid air calculations. Psychrometric charts and Mollier diagrams. Air-condition systems temperatures, absolute and relative humidities and moisture content in air.

Properties of air, LNG, LPG and other common gases. Pipeline capacities and sizing of relief valves.

Design of systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.

Calculating the amount of fertilizer to add to nutrient solutions is part of successful hydroponic production. Calculations only use multiplication, division, and subtraction; no advanced math skills are required.

Chlorine dioxide gas is frequently used in industrial applications to sanitize and disinfect products, surfaces, and areas. A chlorine dioxide gas detector helps measure if there are any high and dangerous levels of ClO2.

"In water treatment, we use ppm to measure the amounts of minerals and gasses dissolved in water. We use water as a medium to transfer heat. As the water transfers heat, these dissolved impurities in ppm can cause problems in the equipment such as mineral scale and corrosion. Water, depending on its characteristics, can only dissolve so many parts per million of a mineral. Then, when we change the temperature and concentration of the water, these minerals may want to come out of solution. We use treatment chemicals measured and added in ppm to help prevent these problems. "

experiments that focus on the two most common everyday activities to the air chemistry of indoor environments: cooking and cleaning. These activities are (1) realistic representations of activities performed in indoor environments and (2) likely to drive interesting chemical reactions that can be better understood through this study.

Dew Point Calculator is a web resource created by the Image Permanence Institute to help express and visualize the relationship between temperature, relative humidity and dew point.

EPA Science Models and Research Tools (SMaRT) Search searches ORD's methods, models, and tools database.

$16.77. 0.5-1,000 ppm(w/w). ***Use within 3 months after opening.

$12.70. Very High Range 0-2500 ppm

$13.99. 10-2,500 ppm(w/w)

$16.99

{Higher accuracy design with dual-color checks} "Test your water sample with WaterWorks pH Check test strips from ITS! A accurate alternative to pH meters without sacrificing quality results."

$15.99. Concentrations 0.5, 2, 5, 10, 25, 50, 100 ppm(w/w)

Residual Chlorine Dioxide Test Strip monitors chlorine dioxide levels, including residuals from 0-10ppm in increments of 0.25, 0.5, 1, 3, 5, and 10.

"a monitoring system indicates the presence of chlorine and/or chlorine dioxide at concentrations below PEL"

{Type of sampling equipment used by OSHA to take air samples to check chlorine dioxide levels}

$353 {Honeywell}

****!!!!****!!!!*** {Dilution, explanation of ppm, mg/L, etc} "What formula what one use to convert a 75% purity Sodium Chlorite powder to 25% solution?"

$348. 1/24 spoke Marty re dental misters.