Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!


Human physiology, air quality and comfort temperatures, activity and metabolic rates, health effects of carbon monoxide and more

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Age and Physical Growth - Weight and Height

Age and physical growth of boys and girls - age 2 to 18 years

Age and Shift in Hearing Threshold

Shift in hearing threshold for men and women

Air Contaminants - Limits

Permissible limits to exposure of various air contaminants

Ammonia - NH3 - Concentration in Air and Health Effects

Ammonia and health symptoms - smell and threat to life

Blood Sugar Units

Convert between blood sugar units

Body Weight versus Body Height

Ideal body weight versus height

Carbon Dioxide Concentration - Comfort Levels

CO2 acceptance and comfort level

Carbon Dioxide Concentrations in Rooms Occupied with People

The carbon dioxide concentration in a room can indicate air quality and ventilation system efficiency

Carbon Dioxide Emission from People

Carbon Dioxide emission from persons depends on activity

Carbon Monoxide and Health Effects

Exposure to Carbon Monoxide - CO and the health effects

Clo - Clothing and Thermal Insulation

Clo is used as a measure of clothes thermal insulation

Clothing, Activity and Human Metabolism

Human metabolism at low and high activity with different levels of clothing

Discomfort Index

Based on dry bulb, wet bulb and dew point temperature

Energy in Food

Energy in carbohydrates, fats and proteins

Food-borne Infections and Diseases

Common bacteria and viruses found in food

Force, Power and Human Operated Machines

Maximum force or power available for human operated machines

Gases Dangerous Concentration Levels

Dangerous and tolerable levels of industrial gases

Globe Temperature

Resultant or globe temperature

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Heat Discomfort Zone

Heat discomfort and maximum work load

Heat Index

Equivalent heat index vs. air temperature and relative humidity - in degrees Fahrenheit and Celsius

Human Effects when Exposed to Low-Frequency Noise and Vibration

Physiological effects from low-frequency noise and vibrations

Human Effort Level - Energy and Heart Rates

Human work effort levels, energy expenditure and associated heart rates

Human Heat Gain

Heat gain from persons in air conditioned spaces - in btu/hr

Human Need of Air

Fresh air is required for respiration and for transport of heat and vapor emitted from the human body

Illuminance - Recommended Light Level

Recommended light levels - illuminance - for some types of working activities


Legionella pneumophila - bacterium that thrives in water supply systems and air conditioning systems - causing the Legionnairs disease

Life Expectancy

Men and Women - age and life expectancy

Maximum Sound Pressure Levels in Rooms

Maximum recommended sound pressure levels in rooms with activities like kindergartens, auditoriums, libraries, cinemas and more ...

Met - Metabolic Rate

Metabiolic Rate - Met - is often used as a measuring unit for human body heat or power production

Metabolic Heat Gain from Persons

Human metabolic heat gain in air conditioned rooms

Physiology - Activity and Metabolic Rate

Heat production from the human body at some common activities

Predicted Mean Vote Index (PMV)

PMV index predicts the mean comfort response of a larger group of people

Recommended Relative Humidity

Recommended relative humidity levels

Relative Humidity and Health

Bacteria, viruses, fungi, mites, asthma and optimum range of relative humidity

Required Rest Time

Relaxation requirements to measures of fatigue

Room Area per Person

Recommended minimum area per person - common values for calculating indoor climate loads

Sound Intensity, Power and Pressure Levels

Introduction to decibel, sound power, sound intensity and sound pressure

Survival Time in Cold Water

Time to exhaustion and death in cold water

Wet Bulb Globe Temperature (WBGT)

The wet bulb globe temperature can be used to measure general heat-stress index

Wind Chill Index

The Wind Chill Index - or the Effective Temperature - of air in movement

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