Re: What type of nut has the most calories?

For a fair comparison, you will need to compare nuts on a weight basis, not a 
size basis. 

To measure calories by burning, you would need a bomb calorimeter or the 
simple method mentioned in the first reference. Search the mad sci archives 
for lots of answers on calorimeters.

You can get calorie values by looking at food labels or from the USDA site 
listed in the references below.You will need to divide the calories in a 
serving by the number of grams per serving to get the same units. The USDA 
site lists kcal units. A kcal is equal to a food calorie. For reference, 
remember that carbohydrate and protein each contain 4 calories/gram and fat 
contains 9 calories/gram. 

A few examples:
Peanut (dry roasted, no salt) - 585 kcal per 100 grams = 5.85 calories per gram
Black walnut - 618 kcal per 100 grams = 6.18 calories per gram
Pecan - 691 kcal per 100 grams = 6.91 calories/gram

Look up other kinds of nuts such as almond, beechnut, brazil nut, cashew, 
chestnut, chinese chestnut, coconut,  corn nuts, ginkgo nut, hickorynut, 
macadamia, pine nut, pistachio, 

You might also want to compare similar snacks such as sunflower seeds, pumpkin 
seeds, raisins, popcorn and acorns. If you want some of the lowest 
calorie/gram foods, look up lettuce or tea, brewed.

References


Re: I would like to be able to measure calories and build a calorimeter


USDA National Nutrient Database for Standard Reference