এছাড়াও পরীক্ষা থেকে আরেকটি নীতি হল এই শরীর দ্বারা হিট লাভের পরিমাণ বা শরীরের দ্বারা হিট হ্রাসের পরিমাণ হিট কোন দিকে প্রবাহিত হচ্ছে তার উপর নির্ মাস করে।
ఈ ప్రయోగంలో మరొక నియమం ఏమిటంటే ఉష్ణం ప్రవహించే దిశను బట్టి వస్తువులు పొందే ఉష్ణం యొక్క పరిమాణం లేదా వస్తువు నష్టపోయే ఉష్ణం యొక్క పరిమాణం ఆధారపడి ఉంటుంది.