You are here:

Chemical Engineering

Recent Answers

2011-12-31 Careers: Engineering & Electrical Trades - VOLTAGE PRESENCE/ABSENCE SENSOR:

You could use a simple voltage divider with the 110VDC going through a 100k resistor, then through a 4.75k resistor to common.  The point between the two resistors (we'll call this the voltage tap) will

2011-12-31 Careers: Chemistry - Extraction and ethanol:

First: Ethanol extraction has been happening with humans since the dawn of the use of oils and dyes.  Ethanol -CAN- be a natural product, depending on the source.  And yes, the amount of alcohol remaining

2011-12-24 Careers: Chemistry - Solubility Product:

Sorry for the delay: It is holiday season and I was away with friends and family.    I am no expert at heavy metal determination, but I know that Yttrium has been detected at low levels for a long time

2011-12-08 Thermodynamics - Entalphy:

I'm trying to convince you that you can only measure differences in both enthalpy and potential energy.  In the equation PE = mgh, PE changes as a function of h.  If you have an object setting on the floor

2011-12-07 Thermodynamics - Entalphy:

Total enthalpy of a system cannot be measured.  Only differences in enthalpy can be measured.  Therefore, you have to have some starting point and that is defined as zero for elements.  It's like electrical

Categories

Browse Alphabetically

©2012 About.com, a part of The New York Times Company. All rights reserved.